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  • js实现购物车数量的增加与减少,js实现购物车数量的自增与自减

    js实现购物车数量的增加与减少,js实现购物车数量的自增与自减

    <!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>js实现购物车数量的增加与减少,js实现购物车数量的自增与自减</title>
    </head>
    
    <body>
    <center>
    <table>
    <tr>
    <td>1</td>
    <td><span onclick="changeNum(this,1)" style="cursor:pointer;">+</span><input type="text" value="" onblur="checknum(this)" /><span onclick="changeNum(this,-1)" style="cursor:pointer;">-</span></td>
    </tr>
    <tr>
    <td>2</td>
    <td><span onclick="changeNum(this,1)" style="cursor:pointer;">+</span><input type="text" value="" onblur="checknum(this)" /><span onclick="changeNum(this,-1)" style="cursor:pointer;">-</span></td>
    </tr>
    <tr>
    <td>3</td>
    <td><span onclick="changeNum(this,1)" style="cursor:pointer;">+</span><input type="text" value="" onblur="checknum(this)" /><span onclick="changeNum(this,-1)" style="cursor:pointer;">-</span></td>
    </tr>
    </table>
    </center>
    <script type="text/javascript">
    function checknum(obj){
        if(obj.value >10){
            obj.value = 10;
            alert('Max 10!');
        }
    }
    function changeNum(obj,num)
    {
        var input = getParent(obj).getElementsByTagName("input");
        for(var i=0;i<input.length;i++)
        {
            if(input[i].type=="text")
            {
                if(input[i].value == "")
                    input[i].value = num;
                else
                    input[i].value = input[i].value - 0 + num;
            }
            if(input[i].value == "-1")
                    input[i].value = 0;
            if(input[i].value == "11")
                    input[i].value = 10;
        } 
    }
    //获取父级对像
    function getParent(obj)
    {
        if(typeof(obj) != "object"){obj = document.getElementById(obj);}
        if(obj)
            return obj.parentElement || obj.parentNode;
    }
    </script>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/afish/p/4098163.html
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