js中对一组数组进行求和 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
</head>
<body>
    <script type="text/javascript">
        var arr = [1,2,3,4,5];  
        console.log(eval(arr.join("+")));

        var str='';  
        for (i in arr){  
           str+=arr[i];  
           str+='+';  

        }  
        str=str.substring(0, str.length - 1);  
        console.log(str);    
    </script>
</body>
</html>

 

posted @ 2017-05-22 15:13  <_/>  阅读(2897)  评论(0)  编辑  收藏  举报