千分符

最新推荐文章于 2022-10-10 16:53:34 发布

最新推荐文章于 2022-10-10 16:53:34 发布 · 462 阅读

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>千分符</title>
</head>
<body>
<script type="text/javascript">
    var str = '12345987553426';
    alert(test(str));
  /*  function test(str) {
        var iNum = str.length%3;
        var prev = '';
        var arr = [];
        var iNow = 0;
        var temp = '';

        if (iNum != 0) {
            prev = str.substring(0,iNum);
            arr.push(prev);
        }

        str = str.substring(iNum);
        for (var i = 0; i < str.length; i++) {
            iNow++;
            temp += str[i];
            if (iNow == 3 && temp) {
                arr.push(temp);
                temp = '';
                iNow = 0;
            }
        }
        return arr.join(',');
    }*/

    function test(str) {
        //(?=)前向声明
        //(?!)反前向声明
        var re = /(?=(?!\b)(\d{3})+$)/g;

        return str.replace(re,',');
    }

//////////////////////////////

var number = 123456789;
console.log(test(number))
    function test(num){
        var str = num+'';
        var re_str = toReverse(str);
        var temp = '';
        for(var i = 1; i<re_str.length+1; i++){
            temp +=re_str[i-1];
            if(i%3===0 && i != re_str.length){
                temp += ','
            }
        }
        return toReverse(temp);
    }

  function toReverse(str) {
    var str = str + '';
     var result = '';
     for(var i = str.length-1; i>=0;i--) {
         result += str[i];
     }
     return result;
 }
</script>
</body>
</html>