千分符

来源：互联网发布：linux删除所有文件夹编辑：程序博客网时间：2024/04/27 20:21
<!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>
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