【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111节 obj math sqrt

教程阅读运行代码

JavaScript sqrt() 方法

实例

返回一个数的平方根：

Math.sqrt(9);

输出结果：

定义和用法

sqrt() 方法可返回一个数的平方根。

浏览器支持

所有主要浏览器都支持 sqrt() 方法。

语法

Math.sqrt(x)

参数值

参数	描述
x	必需。必须是大于等于 0 的数。

返回值

类型	描述
Number/NaN	参数 x 的平方根。如果 x 小于 0，则返回 NaN。

技术细节

JavaScript 版本：

1.0

更多实例

实例

在本例中，我们将返回不同数字的平方根：

var a=Math.sqrt(0);
var b=Math.sqrt(1);
var c=Math.sqrt(9);
var d=Math.sqrt(64);
var e=Math.sqrt(-9);

a,b,c,d, 和 e 输出结果：

0
1
3
8
NaN

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