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  • 根据属性找标签

    <script type="text/javascript">
    
        function checkAll(allNode){
            //找到所有的的选项
            var items = document.getElementsByName("item");
            //找到全选按钮的对象
            //var allNode = document.getElementsByName("all")[0];
            for(var i = 0 ; i<items.length ; i++){
                items[i].checked =     allNode.checked;
            }
        }
        
        
        function getSum(){
            var items = document.getElementsByName("item");
            var sum = 0;
            for(var i = 0 ; i<items.length ; i++){
                if(items[i].checked){
                    sum += parseInt(items[i].value);
                }    
            }    
            var spanNode = document.getElementById("sumid");
            spanNode.innerHTML = ("&nbsp;&nbsp;&nbsp;&yen;"+sum).fontcolor("green");
        }
        
    
    
    </script>
    <body>
        <div>商品列表</div>
            <input type="checkbox" name="item" value="3000" />笔记本电脑3000元<br />
            <input type="checkbox" name="item" value="1800"  />笔记本电脑1800元<br />
            <input type="checkbox" name="item" value="300"  />笔记本电脑300元<br />
            <input type="checkbox" name="item" value="3000"  />笔记本电脑3000元<br />
            <input type="checkbox" name="item" value="3000"  />笔记本电脑3000元<br />
            <input type="checkbox" name="item" value="3000"  />笔记本电脑3000元<br />
            <input type="checkbox" name="all" onclick="checkAll(this)"  /> 全选<br />
            <input type="button" value="总金额:" onclick="getSum()" /><span id="sumid"></span>
    </body>
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  • 原文地址:https://www.cnblogs.com/linst/p/5723543.html
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