题解 | #验证是否是身份证#
购物面板
http://www.nowcoder.com/practice/1448469386f746f5941db2712372f373
<html>
<head>
<meta charset=utf-8>
</head>
<body>
<table>
<thead>
<caption>
商品
</caption>
</thead>
<tbody>
<tr>
<td>炸鸡</td>
<td>28元</td>
<td><button id="zj***ola">-</button></td>
<td><span id="zjsl">0</span></td>
<td><button id="zjtaishaola">+</button></td>
</tr>
<tr>
<td>可乐</td>
<td>5元</td>
<td><button id="kl***ola">-</button></td>
<td><span id="klsl">0</span></td>
<td><button id="kltaishaola">+</button></td>
</tr>
<tr>
<td>总价：</td>
<td><span id="total">0</span></td>
</tr>
</tbody>
</table>
<script type="text/javascript">
// 补全代码
var zj***ola=document.querySelector('#zj***ola');
var zjsl=document.querySelector('#zjsl');
var zjtaishaola=document.querySelector('#zjtaishaola');
var kl***ola=document.querySelector('#kl***ola');
var klsl=document.querySelector('#klsl');
var kltaishaola=document.querySelector('#kltaishaola');
var total=document.querySelector('#total');
zj***ola.onclick=function(){
if(parseInt(zjsl.innerText)>0){
zjsl.innerText=parseInt(zjsl.innerText)-1;
total.innerText=parseInt(total.innerText)-28;
}
}
zjtaishaola.onclick=function(){
zjsl.innerText=parseInt(zjsl.innerText)+1;
total.innerText=parseInt(total.innerText)+28;
}
kl***ola.onclick=function(){
if(parseInt(klsl.innerText)>0){
klsl.innerText=parseInt(klsl.innerText)-1;
total.innerText=parseInt(total.innerText)-5;
}
}
kltaishaola.onclick=function(){
klsl.innerText=parseInt(klsl.innerText)+1;
total.innerText=parseInt(total.innerText)+5;
}
</script>
</body>
</html>
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