请问大神们这是什么意思呢<script>里的

<style type="text/css">
td{
		text-align:center;
		font-family:行书;
		font-weight:bold;
		color:#666;
		}
ul{
		list-style:none;
		color:#946D86;
		height:30px;
		width:500px;
		line-height:30px;
		cursor:pointer;
		}
a{
	text-decoration: none;
	color: #DAA376;
	-moz-border-end-color: #FFF;
	}
</style>
</head>

<body>
	<table border="1px" cellspacing="0px" width="600px" height="150px" id="tb">
    	<tr height="20px">
        	<td width="20%">商品名</td>
            <td>单价</td>
            <td>数量</td>
            <td>总价</td>
        </tr>
        <tr>
        	<td>iphone6</td>
            <td>6300</td>
            <td><a href="javascript:void(0)">&lt;</a><span>1</span><a href="javascript:void(0)">&gt;</a></td>
            <td>6300</td>
        </tr>
        <tr>
        	<td>小米</td>
            <td>1999</td>
            <td><a href="javascript:void(0)">&lt;</a><span>1</span><a href="javascript:void(0)">&gt;</a></td>
            <td>1999</td>
        </tr>
        <tr>
        	<td>华为</td>
            <td>2500</td>
            <td><a href="javascript:void(0)">&lt;</a><span>1</span><a href="javascript:void(0)">&gt;</a></td>
            <td>2500</td>
        </tr>
        <tr>
        	<td colspan="3" style="text-align:right">总计</td>
            <td>0</td>
        </tr>
    </table>
    <ul>
    	<li  onclick="add(this)" price="2500">索尼</li>
        <li  onclick="add(this)" price="2800">htc</li>
        <li  onclick="add(this)" price="1999">锤子</li>
        <li  onclick="add(this)" price="4500">三星</li>
        <li  onclick="add(this)" price="2600">乐视</li>
    </ul>
    <script type="text/javascript">
    	function add(e){
			var bg=document.getElementById("tb");
			var trsum=bg.rows;
			for(var i=1;i<trsum.length-1;i++){
				if(trsum[i].cells[0].innerHTML==e.innerHTML){
					var childs=trsum[i].cells[2].childNodes;
					childs[1].innerHTML=parseInt(childs[1].innerHTML)+1;
					tot();
					return;
					}
				}
		 var tr=bg.insertRow(trsum.length-1);
		 var name=tr.insertCell(0);
		 var price=tr.insertCell(1);
		 var num=tr.insertCell(2);
		 var total=tr.insertCell(3);
		 
		 name.innerHTML=e.innerHTML;
		 price.innerHTML=e.getAttribute("price");
		 num.innerHTML="<a href='javascript:void(0)'>&lt;</a><span>1</span><a href='javascript:void(0)'>&gt;</a>"
		 total.innerHTML=e.getAttribute("price")*1;
		 tot();
			}
		
		
		function tot(){
			var total=0;
			var bg=document.getElementById("tb");
			var trsum=bg.rows;
			for(var i=1;i<trsum.length-1;i++){
				var price=trsum[i].cells[1].innerHTML;
				var num=trsum[i].cells[2].childNodes[1].innerHTML;
				var trtotal=price*num;
				total=total+trtotal;
				trsum[i].cells[3].innerHTML=trtotal;
			}
			trsum[trsum.length-1].cells[1].innerHTML=total;
				
			}
			
    </script>
</body>
</html>

qq_奋斗中的钢子_0

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2回答

qq_奋斗中的钢子_0

function tot(){ var total=0; var bg=document.getElementById("tb"); var trsum=bg.rows; for(var i=1;i<trsum.length-1;i++){ var price=trsum[i].cells[1].innerHTML; var num=trsum[i].cells[2].childNodes[1].innerHTML; var trtotal=price*num; total=total+trtotal; trsum[i].cells[3].innerHTML=trtotal; } trsum[trsum.length-1].cells[1].innerHTML=total;这个也是好多地方看不懂————

qq_奋斗中的钢子_0

for(var i=0;i<trsum.length-1;i++){ if(trsum[i].cells[0].innerHTML==e.innerHTML){ var childs=trsum[i].cells[2].childNodes; childs[1].innerHTML=parseInt(childs[1].innerHTML)+1; 是什么意思呢

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