【第1章】参考: 1.1 JSON parse; 1.2 JSON stringify; 1.3 obj array constructor; 1.4 obj array length; 1.5 obj array prototype; 1.6 obj array concat; 1.7 obj array copyWithin; 1.8 obj array entries; 1.9 obj array every; 1.10 obj array fill; 1.11 obj array filter; 1.12 obj array find; 1.13 obj array findIndex; 1.14 obj array forEach; 1.15 obj array form; 1.16 obj array includes; 1.17 obj array indexOf; 1.18 obj array isArray; 1.19 obj array join; 1.20 obj array keys; 1.21 obj array lastIndexOf; 1.22 obj array map; 1.23 obj array pop; 1.24 obj array push; 1.25 obj array reduce; 1.26 obj array reduceRight; 1.27 obj array reverse; 1.28 obj array shift; 1.29 obj array slice; 1.30 obj array some; 1.31 obj array sort; 1.32 obj array splice; 1.33 obj array toString; 1.34 obj array unshift; 1.35 obj array valueOf; 1.36 obj boolean constructor; 1.37 obj boolean prototype; 1.38 obj boolean toString; 1.39 obj boolean valueOf; 1.40 obj date constructor; 1.41 obj date prototype; 1.42 obj date getDate; 1.43 obj date getDay; 1.44 obj date getFullYear; 1.45 obj date getHours; 1.46 obj date getMilliseconds; 1.47 obj date getMinutes; 1.48 obj date getMonth; 1.49 obj date getSeconds; 1.50 obj date getTime; 1.51 obj date getTimeZoneOffset; 1.52 obj date getUTCDate; 1.53 obj date getUTCDay; 1.54 obj date getUTCFullYear; 1.55 obj date getUTCHours; 1.56 obj date getUTCMilliseconds; 1.57 obj date getUTCMinutes; 1.58 obj date getUTCMonth; 1.59 obj date getUTCSeconds; 1.60 obj date parse; 1.61 obj date setDate; 1.62 obj date setFullYear; 1.63 obj date setHours; 1.64 obj date setMilliseconds; 1.65 obj date setMinutes; 1.66 obj date setMonth; 1.67 obj date setSeconds; 1.68 obj date setTime; 1.69 obj date setUTCDate; 1.70 obj date setUTCFullYear; 1.71 obj date setUTCHours; 1.72 obj date setUTCMilliseconds; 1.73 obj date setUTCMinutes; 1.74 obj date setUTCMonth; 1.75 obj date setUTCSeconds; 1.76 obj date toDateString; 1.77 obj date toISOString; 1.78 obj date toJSON; 1.79 obj date toLocaleDateString; 1.80 obj date toLocaleTimeString; 1.81 obj date toLocaleString; 1.82 obj date toString; 1.83 obj date toTimeString; 1.84 obj date toUTCString; 1.85 obj date UTC; 1.86 obj date valueOf; 1.87 obj math E; 1.88 obj math LN2; 1.89 obj math LN10; 1.90 obj math LOG2E; 1.91 obj math LOG10E; 1.92 obj math PI; 1.93 obj math SORT1 2; 1.94 obj math SORT2; 1.95 obj math abs; 1.96 obj math acos; 1.97 obj math asin; 1.98 obj math atan; 1.99 obj math atan2; 1.100 obj math ceil; 1.101 obj math cos; 1.102 obj math exp; 1.103 obj math floor; 1.104 obj math log; 1.105 obj math max; 1.106 obj math min; 1.107 obj math pow; 1.108 obj math random; 1.109 obj math round; 1.110 obj math sin; 1.111 obj math sqrt; 1.112 obj math tan; 1.113 obj number constructor; 1.114 obj number MAX VALUE; 1.115 obj number MIN VALUE; 1.116 obj number NEGATIVE INFINITY; 1.117 obj number NaN; 1.118 obj number POSITIVE INFINITY; 1.119 obj number prototype; 1.120 obj number isFinite; 1.121 obj number toExponential; 1.122 obj number toFixed; 1.123 obj number toPrecision; 1.124 obj number toString; 1.125 obj number valueOf; 1.126 obj string constructor; 1.127 obj string length; 1.128 obj string prototype; 1.129 obj string charAt; 1.130 obj string charCodeAt; 1.131 obj string concat; 1.132 obj string fromCharCode; 1.133 obj string indexOf; 1.134 obj string includes; 1.135 obj string lastIndexOf; 1.136 obj string match; 1.137 obj string repeat; 1.138 obj string replace; 1.139 obj string search; 1.140 obj string slice; 1.141 obj string split; 1.142 obj string startsWith; 1.143 obj string substr; 1.144 obj string substring; 1.145 obj string toLowerCase; 1.146 obj string toUpperCase; 1.147 obj string trim; 1.148 obj string toLocaleLowerCase; 1.149 obj string toLocaleUpperCase; 1.150 obj string valueOf; 1.151 obj string toString; 1.152 obj string anchor; 1.153 obj string big; 1.154 obj string blink; 1.155 obj string bold; 1.156 obj string fixed; 1.157 obj string fontcolor; 1.158 obj string fontsize; 1.159 obj string italics; 1.160 obj string link; 1.161 obj string small; 1.162 obj string strike; 1.163 obj string sub; 1.164 obj string sup; 1.165 obj regexp i; 1.166 obj regexp g; 1.167 obj regexp abc; 1.168 obj regexp ^abc; 1.169 obj regexp dot; 1.170 obj regexp lower w; 1.171 obj regexp upper W; 1.172 obj regexp lower d; 1.173 obj regexp upper D; 1.174 obj regexp lower s; 1.175 obj regexp upper S; 1.176 obj regexp lower b; 1.177 obj regexp upper B; 1.178 obj regexp n; 1.179 obj regexp xxx; 1.180 obj regexp xdd; 1.181 obj regexp uxxxx; 1.182 obj regexp n+; 1.183 obj regexp n*; 1.184 obj regexp n?; 1.185 obj regexp nx; 1.186 obj regexp nx comma; 1.187 obj regexp nxy; 1.188 obj regexp n$; 1.189 obj regexp ^n; 1.190 obj regexp ?=n; 1.191 obj regexp ?!n; 1.192 obj regexp compile; 1.193 obj regexp exec; 1.194 obj regexp test; 1.195 obj regexp toString; 1.196 obj regexp search; 1.197 obj regexp match; 1.198 obj regexp replace; 1.199 obj regexp split; 1.200 obj regexp constructor; 1.201 obj regexp global; 1.202 obj regexp ignoreCase; 1.203 obj regexp lastIndex; 1.204 obj regexp multiline; 1.205 obj regexp source; 1.206 obj global infinity; 1.207 obj global NaN; 1.208 obj global undefined; 1.209 obj global decodeURI; 1.210 obj global decodeURIComponent; 1.211 obj global encodeURI; 1.212 obj global encodeURIComponent; 1.213 obj global escape; 1.214 obj global eval; 1.215 obj global isFinite; 1.216 obj global isNaN; 1.217 obj global Number; 1.218 obj global parseFloat; 1.219 obj global parseInt; 1.220 obj global string; 1.221 obj global unescape; 1.222 obj error name; 1.223 obj error message; 1.224 bom window closed; 1.225 bom window defaultStatus; 1.226 bom window frames; 1.227 bom window innerWidth; 1.228 bom window localStorage; 1.229 bom window length; 1.230 bom window name; 1.231 bom window opener; 1.232 bom window outerWidth; 1.233 bom window pageXOffset; 1.234 bom window parent; 1.235 bom window screenLeft; 1.236 bom window screenX; 1.237 bom window sessionStorage; 1.238 bom window self; 1.239 bom window status; 1.240 bom window top; 1.241 bom window alert; 1.242 bom window atob; 1.243 bom window btoa; 1.244 bom window blur; 1.245 bom window clearInterval; 1.246 bom window clearTimeout; 1.247 bom window close; 1.248 bom window confirm; 1.249 bom window createPopup; 1.250 bom window focus; 1.251 bom window getComputedStyle; 1.252 bom window matchMedia; 1.253 bom window moveBy; 1.254 bom window moveTo; 1.255 bom window open; 1.256 bom window print; 1.257 bom window prompt; 1.258 bom window resizeBy; 1.259 bom window resizeTo; 1.260 bom window scrollBy; 1.261 bom window scrollTo; 1.262 bom window setInterval; 1.263 bom window setTimeout; 1.264 bom window stop; 1.265 bom navigator appCodeName; 1.266 bom navigator appName; 1.267 bom navigator appVersion; 1.268 bom navigator cookieEnabled; 1.269 bom navigator platform; 1.270 bom navigator userAgent; 1.271 bom navigator javaEnabled; 1.272 bom navigator taintEnabled; 1.273 bom screen availHeight; 1.274 bom screen availWidth; 1.275 bom screen colorDepth; 1.276 bom screen height; 1.277 bom screen pixelDepth; 1.278 bom screen width; 1.279 bom history length; 1.280 bom history back; 1.281 bom history forward; 1.282 bom history go; 1.283 bom location hash; 1.284 bom location host; 1.285 bom location hostname; 1.286 bom location href; 1.287 bom location pathname; 1.288 bom location port; 1.289 bom location protocol; 1.290 bom location search; 1.291 bom location assign; 1.292 bom location reload; 1.293 bom location replace; 1.294 dom document activeElement; 1.295 dom document addEventListener; 1.296 dom document adoptNode; 1.297 dom document anchors; 1.298 dom document baseURI; 1.299 dom document body; 1.300 dom document close; 1.301 dom document cookie; 1.302 dom document createAttribute; 1.303 dom document createComment; 1.304 dom document createDocumentFragment; 1.305 dom document createElement; 1.306 dom document createTextNode; 1.307 dom document doctype; 1.308 dom document documentElement; 1.309 dom document documentMode; 1.310 dom document documentURI; 1.311 dom document domain; 1.312 dom document embeds; 1.313 dom document forms; 1.314 dom document getElementsByClassName; 1.315 dom document getElementById; 1.316 dom document getElementsByName; 1.317 dom document getElementsByTagName; 1.318 dom document images; 1.319 dom document implementation; 1.320 dom document importNode; 1.321 dom document inputEncoding; 1.322 dom document lastModified; 1.323 dom document links; 1.324 dom document normalize; 1.325 dom document normalizeDocument; 1.326 dom document open; 1.327 dom document querySelector; 1.328 dom document querySelectorAll; 1.329 dom document readyState; 1.330 dom document referrer; 1.331 dom document removeEventListener; 1.332 dom document renameNode; 1.333 dom document scripts; 1.334 dom document strictErrorChecking; 1.335 dom document title; 1.336 dom document URL; 1.337 dom document write; 1.338 dom document writeln; 1.339 dom element accessKey; 1.340 dom element addEventListener; 1.341 dom element appendChild; 1.342 dom element attributes; 1.343 dom element childNodes; 1.344 dom element children; 1.345 dom element classList; 1.346 dom element className; 1.347 dom element cloneNode; 1.348 dom element compareDocumentPosition; 1.349 dom element contentEditable; 1.350 dom element dir; 1.351 dom element firstChild; 1.352 dom element focus; 1.353 dom element getAttribute; 1.354 dom element getAttributeNode; 1.355 dom element getElementsByTagName; 1.356 dom element getElementsByClassName; 1.357 dom element hasAttribute; 1.358 dom element hasAttributes; 1.359 dom element hasChildNodes; 1.360 dom element hasFocus; 1.361 dom element id; 1.362 dom element innerHTML; 1.363 dom element insertBefore; 1.364 dom element isContentEditable; 1.365 dom element isDefaultNamespace; 1.366 dom element isEqualNode; 1.367 dom element isSameNode; 1.368 dom element isSupported; 1.369 dom element lang; 1.370 dom element lastChild; 1.371 dom element namespaceURI; 1.372 dom element nextSibling; 1.373 dom element nextElementSibling; 1.374 dom element nodeName; 1.375 dom element nodeType; 1.376 dom element nodeValue; 1.377 dom element normalize; 1.378 dom element ownerDocument; 1.379 dom element parentNode; 1.380 dom element previousSibling; 1.381 dom element previousElementSibling; 1.382 dom element querySelector; 1.383 dom element removeAttribute; 1.384 dom element removeAttributeNode; 1.385 dom element removeChild; 1.386 dom element removeEventListener; 1.387 dom element replaceChild; 1.388 dom element setAttribute; 1.389 dom element setAttributeNode; 1.390 dom element tabIndex; 1.391 dom element tagName; 1.392 dom element textContent; 1.393 dom element title; 1.394 dom element item; 1.395 dom element length; 1.396 dom attribute isId; 1.397 dom attribute name; 1.398 dom attribute value; 1.399 dom attribute specified; 1.400 dom attribute getNamedItem; 1.401 dom attribute item; 1.402 dom attribute length; 1.403 dom attribute removeNamedItem; 1.404 dom attribute setNamedItem; 1.405 dom event onclick; 1.406 dom event oncontextmenu; 1.407 dom event ondblclick; 1.408 dom event onmousedown; 1.409 dom event onmouseenter; 1.410 dom event onmouseleave; 1.411 dom event onmousemove; 1.412 dom event onmouseover; 1.413 dom event onmouseout; 1.414 dom event onmouseup; 1.415 dom event onkeydown; 1.416 dom event onkeypress; 1.417 dom event onkeyup; 1.418 dom event onabort; 1.419 dom event onbeforeunload; 1.420 dom event onerror; 1.421 dom event onhashchange; 1.422 dom event onload; 1.423 dom event onpageshow; 1.424 dom event onpagehide; 1.425 dom event onresize; 1.426 dom event onscroll; 1.427 dom event onunload; 1.428 dom event onblur; 1.429 dom event onchange; 1.430 dom event onfocus; 1.431 dom event onfocusin; 1.432 dom event onfocusout; 1.433 dom event oninput; 1.434 dom event onreset; 1.435 dom event onsearch; 1.436 dom event onselect; 1.437 dom event onsubmit; 1.438 dom event oncopy; 1.439 dom event oncut; 1.440 dom event onpaste; 1.441 dom event onafterprint; 1.442 dom event onbeforeprint; 1.443 dom event ondrag; 1.444 dom event ondragend; 1.445 dom event ondragenter; 1.446 dom event ondragleave; 1.447 dom event ondragover; 1.448 dom event ondragstart; 1.449 dom event ondrop; 1.450 dom event onabort video; 1.451 dom event oncanplay; 1.452 dom event oncanplaythrough; 1.453 dom event ondurationchange; 1.454 dom event onended; 1.455 dom event onerror video; 1.456 dom event onloadeddata; 1.457 dom event onloadedmetadata; 1.458 dom event onloadstart; 1.459 dom event onpause; 1.460 dom event onplay; 1.461 dom event onplaying; 1.462 dom event onprogress; 1.463 dom event onratechange; 1.464 dom event onseeked; 1.465 dom event onseeking; 1.466 dom event onstalled; 1.467 dom event onsuspend; 1.468 dom event ontimeupdate; 1.469 dom event onvolumechange; 1.470 dom event onwaiting; 1.471 dom event animationend; 1.472 dom event animationiteration; 1.473 dom event animationstart; 1.474 dom event transitionend; 1.475 dom event ononline; 1.476 dom event onoffline; 1.477 dom event onshow; 1.478 dom event ontoggle; 1.479 dom event onwheel; 1.480 dom event bubbles; 1.481 dom event cancelable; 1.482 dom event currentTarget; 1.483 dom event target; 1.484 dom event timestamp; 1.485 dom event type; 1.486 dom event altKey; 1.487 dom event button; 1.488 dom event clientX; 1.489 dom event clientY; 1.490 dom event ctrlKey; 1.491 dom event location; 1.492 dom event charCode; 1.493 dom event key; 1.494 dom event keyCode; 1.495 dom event which; 1.496 dom event metaKey; 1.497 dom event relatedTargt; 1.498 dom event screenX; 1.499 dom event screenY; 1.500 dom event shiftKey; 1.501 dom console assert; 1.502 dom console clear; 1.503 dom console count; 1.504 dom console error; 1.505 dom console group; 1.506 dom console groupCollapsed; 1.507 dom console groupEnd; 1.508 dom console info; 1.509 dom console log; 1.510 dom console table; 1.511 dom console time; 1.512 dom console timeEnd; 1.513 dom console trace; 1.514 dom console warn; 1.515 dom css cssText; 1.516 dom css length; 1.517 dom css parentRule; 1.518 dom css getPropertyPriority; 1.519 dom css getPropertyValue; 1.520 dom css item; 1.521 dom css removeProperty; 1.522 dom css setProperty; 1.523 dom collection item; 1.524 dom collection length; 1.525 dom collection namedItem; 1.526 dom anchor charset; 1.527 dom anchor href; 1.528 dom anchor hreflang; 1.529 dom anchor name; 1.530 dom anchor rel; 1.531 dom anchor target; 1.532 dom anchor type; 1.533 dom area alt; 1.534 dom area coords; 1.535 dom area hash; 1.536 dom area host; 1.537 dom area hostname; 1.538 dom area href; 1.539 dom area noHref; 1.540 dom area pathname; 1.541 dom area port; 1.542 dom area protocol; 1.543 dom area search; 1.544 dom area shape; 1.545 dom area target; 1.546 dom audio audioTracks; 1.547 dom audio autoplay; 1.548 dom audio buffered; 1.549 dom audio controller; 1.550 dom audio controls; 1.551 dom audio currentSrc; 1.552 dom audio currentTime; 1.553 dom audio defaultMuted; 1.554 dom audio defaultPlaybackRate; 1.555 dom audio duration; 1.556 dom audio ended; 1.557 dom audio error; 1.558 dom audio loop; 1.559 dom audio mediaGroup; 1.560 dom audio muted; 1.561 dom audio networkState; 1.562 dom audio paused; 1.563 dom audio playbackRate; 1.564 dom audio played; 1.565 dom audio preload; 1.566 dom audio readyState; 1.567 dom audio seekable; 1.568 dom audio seeking; 1.569 dom audio src; 1.570 dom audio textTracks; 1.571 dom audio volume; 1.572 dom audio addTextTrack; 1.573 dom audio play; 1.574 dom audio pause; 1.575 dom base href; 1.576 dom base target; 1.577 dom blockquote cite; 1.578 dom body aLink; 1.579 dom body background; 1.580 dom body bgColor; 1.581 dom body link; 1.582 dom body text; 1.583 dom body vLink; 1.584 dom body onload; 1.585 dom button disabled; 1.586 dom button form; 1.587 dom button name; 1.588 dom button type; 1.589 dom button value; 1.590 dom canvas fillStyle; 1.591 dom canvas strokeStyle; 1.592 dom canvas shadowColor; 1.593 dom canvas shadowBlur; 1.594 dom canvas shadowOffsetX; 1.595 dom canvas shadowOffsetY; 1.596 dom canvas createLinearGradient; 1.597 dom canvas createPattern; 1.598 dom canvas createRadialGradient; 1.599 dom canvas addColorStop; 1.600 dom canvas lineCap; 1.601 dom canvas lineJoin; 1.602 dom canvas lineWidth; 1.603 dom canvas miterLimit; 1.604 dom canvas rect; 1.605 dom canvas fillRect; 1.606 dom canvas strokeRect; 1.607 dom canvas clearRect; 1.608 dom canvas fill; 1.609 dom canvas stroke; 1.610 dom canvas beginPath; 1.611 dom canvas moveTo; 1.612 dom canvas closePath; 1.613 dom canvas lineTo; 1.614 dom canvas clip; 1.615 dom canvas quadraticCurveTo; 1.616 dom canvas bezierCurveTo; 1.617 dom canvas arc; 1.618 dom canvas arcTo; 1.619 dom canvas isPointLnPath; 1.620 dom canvas scale; 1.621 dom canvas rotate; 1.622 dom canvas translate; 1.623 dom canvas transform; 1.624 dom canvas setTransform; 1.625 dom canvas font; 1.626 dom canvas textAlign; 1.627 dom canvas textBaseline; 1.628 dom canvas fillText; 1.629 dom canvas strokeText; 1.630 dom canvas measureText; 1.631 dom canvas drawImage; 1.632 dom canvas width; 1.633 dom canvas height; 1.634 dom canvas data; 1.635 dom canvas createImageData; 1.636 dom canvas getImageData; 1.637 dom canvas putImageData; 1.638 dom canvas globalAlpha; 1.639 dom canvas globalCompositeOperation; 1.640 dom column span; 1.641 dom columngroup span; 1.642 dom datalist options; 1.643 dom del cite; 1.644 dom del dateTime; 1.645 dom details open; 1.646 dom dialog open; 1.647 dom dialog close; 1.648 dom dialog show; 1.649 dom dialog showModal; 1.650 dom embed height; 1.651 dom embed src; 1.652 dom embed type; 1.653 dom embed width; 1.654 dom fieldset disabled; 1.655 dom fieldset form; 1.656 dom fieldset name; 1.657 dom fieldset type; 1.658 dom form elements; 1.659 dom form acceptCharset; 1.660 dom form action; 1.661 dom form enctype; 1.662 dom form length; 1.663 dom form method; 1.664 dom form name; 1.665 dom form target; 1.666 dom form reset; 1.667 dom form submit; 1.668 dom form onreset; 1.669 dom form onsubmit; 1.670 dom frame align; 1.671 dom frame contentDocument; 1.672 dom frame contentWindow; 1.673 dom frame frameBorder; 1.674 dom frame height; 1.675 dom frame longDesc; 1.676 dom frame marginHeight; 1.677 dom frame marginWidth; 1.678 dom frame name; 1.679 dom frame noResize; 1.680 dom frame scrolling; 1.681 dom frame src; 1.682 dom frame width; 1.683 dom frame onload; 1.684 dom frameset cols; 1.685 dom frameset rows; 1.686 dom frameset onload; 1.687 dom img align; 1.688 dom img alt; 1.689 dom img border; 1.690 dom img complete; 1.691 dom img height; 1.692 dom img hspace; 1.693 dom img longDesc; 1.694 dom img lowsrc; 1.695 dom img name; 1.696 dom img src; 1.697 dom img useMap; 1.698 dom img vspace; 1.699 dom img width; 1.700 dom img onabort; 1.701 dom img onerror; 1.702 dom img onload; 1.703 dom ins cite; 1.704 dom ins dateTime; 1.705 dom input button disabled; 1.706 dom input button form; 1.707 dom input button name; 1.708 dom input button type; 1.709 dom input button value; 1.710 dom input checkbox disabled; 1.711 dom input checkbox checked; 1.712 dom input checkbox defaultChecked; 1.713 dom input checkbox form; 1.714 dom input checkbox name; 1.715 dom input checkbox type; 1.716 dom input checkbox value; 1.717 dom input color autofocus; 1.718 dom input color disabled; 1.719 dom input color form; 1.720 dom input color name; 1.721 dom input color type; 1.722 dom input color value; 1.723 dom input date autofocus; 1.724 dom input date disabled; 1.725 dom input date form; 1.726 dom input date name; 1.727 dom input date readOnly; 1.728 dom input date required; 1.729 dom input date type; 1.730 dom input date value; 1.731 dom input datetime autofocus; 1.732 dom input datetime disabled; 1.733 dom input datetime form; 1.734 dom input datetime name; 1.735 dom input datetime readOnly; 1.736 dom input datetime required; 1.737 dom input datetime type; 1.738 dom input datetime value; 1.739 dom input datetimelocal autofocus; 1.740 dom input datetimelocal disabled; 1.741 dom input datetimelocal form; 1.742 dom input datetimelocal name; 1.743 dom input datetimelocal readOnly; 1.744 dom input datetimelocal required; 1.745 dom input datetimelocal type; 1.746 dom input datetimelocal value; 1.747 dom input email autocomplete; 1.748 dom input email autofocus; 1.749 dom input email defaultValue; 1.750 dom input email disabled; 1.751 dom input email form; 1.752 dom input email maxLength; 1.753 dom input email multiple; 1.754 dom input email name; 1.755 dom input email pattern; 1.756 dom input email placeholder; 1.757 dom input email readOnly; 1.758 dom input email required; 1.759 dom input email type; 1.760 dom input email value; 1.761 dom input file disabled; 1.762 dom input file accept; 1.763 dom input file form; 1.764 dom input file name; 1.765 dom input file type; 1.766 dom input file value; 1.767 dom input hidden form; 1.768 dom input hidden name; 1.769 dom input hidden type; 1.770 dom input hidden value; 1.771 dom input month autofocus; 1.772 dom input month disabled; 1.773 dom input month form; 1.774 dom input month name; 1.775 dom input month readOnly; 1.776 dom input month required; 1.777 dom input month type; 1.778 dom input month value; 1.779 dom input number autofocus; 1.780 dom input number disabled; 1.781 dom input number form; 1.782 dom input number name; 1.783 dom input number placeholder; 1.784 dom input number readOnly; 1.785 dom input number required; 1.786 dom input number type; 1.787 dom input number value; 1.788 dom input range autofocus; 1.789 dom input range disabled; 1.790 dom input range form; 1.791 dom input range name; 1.792 dom input range type; 1.793 dom input range value; 1.794 dom input password defaultValue; 1.795 dom input password disabled; 1.796 dom input password form; 1.797 dom input password maxLength; 1.798 dom input password name; 1.799 dom input password readOnly; 1.800 dom input password size; 1.801 dom input password type; 1.802 dom input password value; 1.803 dom input password select; 1.804 dom input radio checked; 1.805 dom input radio defaultChecked; 1.806 dom input radio disabled; 1.807 dom input radio form; 1.808 dom input radio name; 1.809 dom input radio type; 1.810 dom input radio value; 1.811 dom input reset disabled; 1.812 dom input reset form; 1.813 dom input reset name; 1.814 dom input reset type; 1.815 dom input reset value; 1.816 dom input search autofocus; 1.817 dom input search disabled; 1.818 dom input search form; 1.819 dom input search maxLength; 1.820 dom input search name; 1.821 dom input search readOnly; 1.822 dom input search required; 1.823 dom input search size; 1.824 dom input search type; 1.825 dom input search value; 1.826 dom input submit disabled; 1.827 dom input submit form; 1.828 dom input submit name; 1.829 dom input submit type; 1.830 dom input submit value; 1.831 dom input text autofocus; 1.832 dom input text defaultValue; 1.833 dom input text disabled; 1.834 dom input text form; 1.835 dom input text maxLength; 1.836 dom input text name; 1.837 dom input text placeholder; 1.838 dom input text readOnly; 1.839 dom input text required; 1.840 dom input text size; 1.841 dom input text type; 1.842 dom input text value; 1.843 dom input text blur; 1.844 dom input text focus; 1.845 dom input text select; 1.846 dom input time autofocus; 1.847 dom input time disabled; 1.848 dom input time form; 1.849 dom input time name; 1.850 dom input time readOnly; 1.851 dom input time required; 1.852 dom input time type; 1.853 dom input time value; 1.854 dom input url autofocus; 1.855 dom input url disabled; 1.856 dom input url form; 1.857 dom input url maxLength; 1.858 dom input url name; 1.859 dom input url readOnly; 1.860 dom input url required; 1.861 dom input url size; 1.862 dom input url type; 1.863 dom input url value; 1.864 dom input week autofocus; 1.865 dom input week disabled; 1.866 dom input week form; 1.867 dom input week name; 1.868 dom input week readOnly; 1.869 dom input week required; 1.870 dom input week type; 1.871 dom input week value; 1.872 dom keygen autofocus; 1.873 dom keygen disabled; 1.874 dom keygen form; 1.875 dom keygen keytype; 1.876 dom keygen name; 1.877 dom keygen type; 1.878 dom link charset; 1.879 dom link href; 1.880 dom link hreflang; 1.881 dom link media; 1.882 dom link rel; 1.883 dom link rev; 1.884 dom link type; 1.885 dom label form; 1.886 dom label htmlFor; 1.887 dom legend form; 1.888 dom li value; 1.889 dom map areas; 1.890 dom map name; 1.891 dom meta content; 1.892 dom meta httpEquiv; 1.893 dom meta name; 1.894 dom meta scheme; 1.895 dom meter high; 1.896 dom meter low; 1.897 dom meter max; 1.898 dom meter min; 1.899 dom meter optimum; 1.900 dom meter value; 1.901 dom ol reversed; 1.902 dom ol start; 1.903 dom ol type; 1.904 dom optgroup disabled; 1.905 dom optgroup label; 1.906 dom option defaultSelected; 1.907 dom option disabled; 1.908 dom option form; 1.909 dom option index; 1.910 dom option selected; 1.911 dom option text; 1.912 dom option value; 1.913 dom param name; 1.914 dom param value; 1.915 dom progress max; 1.916 dom progress position; 1.917 dom progress value; 1.918 dom q cite; 1.919 dom script async; 1.920 dom script charset; 1.921 dom script defer; 1.922 dom script src; 1.923 dom script text; 1.924 dom script type; 1.925 dom select options; 1.926 dom select disabled; 1.927 dom select form; 1.928 dom select length; 1.929 dom select multiple; 1.930 dom select name; 1.931 dom select selectedIndex; 1.932 dom select size; 1.933 dom select type; 1.934 dom select add; 1.935 dom select remove; 1.936 dom source media; 1.937 dom source src; 1.938 dom source type; 1.939 dom style alignContent; 1.940 dom style alignItems; 1.941 dom style alignSelf; 1.942 dom style animation; 1.943 dom style animationDelay; 1.944 dom style animationDirection; 1.945 dom style animationDuration; 1.946 dom style animationFillMode; 1.947 dom style animationIterationCount; 1.948 dom style animationName; 1.949 dom style animationTimingFunction; 1.950 dom style animationPlayState; 1.951 dom style background; 1.952 dom style backgroundAttachment; 1.953 dom style backgroundColor; 1.954 dom style backgroundImage; 1.955 dom style backgroundPosition; 1.956 dom style backgroundRepeat; 1.957 dom style backgroundClip; 1.958 dom style backgroundOrigin; 1.959 dom style backgroundSize; 1.960 dom style backfaceVisibility; 1.961 dom style border; 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第1章第123节 obj number toPrecision

教程阅读运行代码

JavaScript toPrecision() 方法

实例

把数字格式化为指定的长度：

var num = new Number(13.3714);
var n=num.toPrecision(2);

n 输出结果：

尝试一下

定义和用法

toPrecision() 方法可在对象的值超出指定位数时将其转换为指数计数法。

浏览器支持

所有主要浏览器都支持 toPrecision() 方法。

语法

number.toPrecision(x)

参数值

参数	描述
x	必需。规定必须被转换为指数计数法的最小位数。该参数是 1 ~ 21 之间（且包括 1 和 21）的值。有效实现允许有选择地支持更大或更小的 num。如果省略了该参数，则调用方法 toString()，而不是把数字转换成十进制的值。

返回值

类型	描述
String	指定精度的数字格式

技术细节

JavaScript 版本：

1.5

第1章 第123节 obj number toPrecision

JavaScript toPrecision() 方法

定义和用法

浏览器支持

语法

参数值

返回值

技术细节

更多实例

第1章第123节 obj number toPrecision