The following is a super simple shopping cart I made, all made with native js
css
<style> table{ text-align: center; } table img{ width: 50px; } a { text-decoration: none; color: red; } </style>
body
<table border="1" cellspacing="0"> <thead> <tr> <th>全选 <input type="checkbox" id="ckAll"/></th> <th>商品</th> <th>单价</th> <th>数量</th> <th>操作</th> </tr> </thead> <tbody> <tr> <td><input type="checkbox" name="ck"/></td> <td>![](../img2/1.png)</td> <td>3</td> <td><input type="number" max="10" min="0" step="1" value="2"/></td> <td><a href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="del">删除</a></td> </tr> <tr><td><input type="checkbox" name="ck"/></td> <td>![](../img2/2.png)</td> <td>3</td> <td><input type="number" max="10" min="0" step="1" value="3"/></td> <td><a href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="del">删除</a></td> </tr> <tr><td><input type="checkbox" name="ck"/></td> <td>![](../img2/3.png)</td> <td>3</td> <td><input type="number" max="10" min="0" step="1" value="1"/></td> <td><a href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="del">删除</a></td> </tr></tbody> <tfoot> <tr> <td colspan="3" align="right">总价:</td> <td colspan="2"></td> </tr> </tfoot> </table> <a href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="dels">删除选中项</a>
js
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<script> window.onload=function(){ document.getElementById("ckAll").onclick=function(){//当点击全选的复合框时触发事件 var cks = document.getElementsByName("ck");//获取ck对象 for(var i=0;i<cks.length;i++){ //循环得到单个tr cks[i].checked=this.checked; //得到的每个tr的点击都等于ckAll的点击 } } var cks = document.getElementsByName("ck");//创建ck对象 for(var i=0;i<cks.length;i++){ //循环得到单个tr cks[i].onclick=function(){ // 当点击每个当tr的时候都会触发点击事件 for(var i=0;i<cks.length;i++){// 循环得到单个td if(!cks[i].checked){ //如果单个特点的点击等于false 就返回 document.getElementById("ckAll").checked = false;//那么ckAll就等于false return; } } document.getElementById("ckAll").checked = true;//否则就等于true 说明为全选状态 } } getSum(); function getSum(){ //计算的方法 var tbody = document.getElementsByTagName("tbody")[0];//创建tbody对象 var sum =0;//先定义sum为0 for(var i =0;i<tbody.children.length;i++){ //循环得到tr var tr = tbody.children[i]; //tbody中的子节点就是tr var td = tr.children; //tr的子节点是 td var price = parseFloat(td[2].innerText);//td的第二列是价格 得到价格 var count = parseFloat(td[3].children[0].value); //第三列是数量 sum+=price*count; //总和就等于价格*数量 td[3].children[0].onblur=function(){ //当失去焦点的时候触发事件 getSum(); } } var tfoot = document.getElementsByTagName("tfoot")[0]; //创景tfoot对象 tfoot.children[0].children[1].innerHTML =sum; //tfootd子节点 等于总和 } var dels = document.getElementsByClassName("del");//创建del对象 for(var i = 0;i<dels.length;i++){//循环得到 dels[i].onclick=function(){ this.parentNode.parentNode.remove(); getSum(); } } document.getElementsByClassName("dels")[0].onclick=function(){ var cks = document.getElementsByName("ck"); for(var i = cks.length-1;i>=0;i--){ if(cks[i].checked){ cks[i].parentNode.parentNode.remove(); } } getSum(); } } </script>
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