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  • JavaScript格式化金额及格式化输出

    格式化金额的函数

    /*
     * 格式化金额,
     * num为十进制Number类型的原值,
     * n为保留的小数位数
     * return 格式化后的金额字符串
     */
    function formatNum(num, n){
        
        var numStr = num.toString(),
            pointIndex = numStr.indexOf('.'),
            beforePoint,
            afterPoint;
        if(pointIndex < 0){
            beforePoint = numStr;
            afterPoint = '';
        }else{
            beforePoint = numStr.substring(0, pointIndex);
            if(typeof n == 'undefined'){
                afterPoint = numStr.substring(pointIndex);
            }else{
                afterPoint = numStr.substring(pointIndex, pointIndex + n + 1);
            }
        }
        var re = /(-?\d+)(\d{3})/;
        while(re.test(beforePoint)){
            beforePoint = beforePoint.replace(re,"$1,$2");
        }
        return beforePoint + afterPoint;
    }
    

    格式化输出

    /*
     * 格式化输出,
     * str为输入的字符串,变量用{}包括
     * obj为参数对象
     */
    function formatStr(str, obj){
        for(var name in obj){
            str = str.split('{' + name + '}').join(obj[name]);
        }
        return str;
    }
    

    另一种格式化输出

    /*
     * 格式化输出,
     * str为输入的字符串,变量用{}包括
     * arr为参数数组
     */
    function formatStr(str, arr){
        var i,len = arr.length;
        for(i = 0; i < len; i++){
            str = str.split('{' + i + '}').join(arr[i]);
        }
        return str;
    }
    

      

      

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  • 原文地址:https://www.cnblogs.com/realwall/p/2217884.html
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