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  • 商品计算

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>无标题文档</title>
    <style>
    *{ margin:0; padding:0}
    em{ font-style:normal}
    li{ list-style:none}
    #list{ margin:20px auto; 400px;}

    #list input{ 25px; height:25px; text-align:center;}

    #total{text-align:center;}
    </style>
    <script>
    /*
    重用代码:
    1、尽量保证 HTML 代码结构一致,可以通过父级选取子元素
    2、把核心主程序实现,用函数包起来
    3、把每组里不同的值找出来,通过传参实现
    */
    window.οnlοad=function(){
    var oUl=document.getElementById('list');
    var oTotal=document.getElementById('total');
    var aLi=oUl.getElementsByTagName('li');
    for(var i=0; i<aLi.length;i++){
    fn1(aLi[i]);
    }
    function fn1(oLi){
    var aBtn = oLi.getElementsByTagName('input');
    var oStrong = oLi.getElementsByTagName('strong')[0];
    var oEm = oLi.getElementsByTagName('em')[0];
    var oSpan = oLi.getElementsByTagName('span')[0];
    var n1 = Number(oStrong.innerHTML); // '0' => 0
    var n2 = parseFloat(oEm.innerHTML); // '12.5元' => 12.5
    var n2 = parseFloat(oEm.innerHTML);
    aBtn[0].onclick = function (){
    n1 --;
    if ( n1 < 0 ) {
    n1 = 0;
    }
    oStrong.innerHTML = n1;
    oSpan.innerHTML = n1*n2 + '元';
    };
    aBtn[1].onclick = function (){
    n1 ++;
    oStrong.innerHTML = n1;
    oSpan.innerHTML = n1*n2 + '元';
    };
    }
    }
    </script>
    </head>
    <ul id="list">
    <li>
    <input type="button" value="-" />
    <strong>0</strong>
    <input type="button" value="+"/>
    单价:<em>35元</em>小计:<span>0元</span></li>
    <li>
    <input type="button" value="-" />
    <strong>0</strong>
    <input type="button" value="+"/>
    单价:<em>12元</em>小计:<span>0元</span></li>
    <li>
    <input type="button" value="-" />
    <strong>0</strong>
    <input type="button" value="+"/>
    单价:<em>15元</em>小计:<span>0元</span></li>
    <li>
    <input type="button" value="-" />
    <strong>0</strong>
    <input type="button" value="+"/>
    单价:<em>25元</em>小计:<span>0元</span></li>
    </ul>
    <p id="total">总计<span>0</span>件商品,一共<em>0</em>元</p>
    <body>
    </body>
    </html>

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  • 原文地址:https://www.cnblogs.com/Xuman0927/p/12050858.html
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