/* * caculate * input:  100000  * output: 100,000*/(function ($) {    var $input = $("#cacu-input"),        $btn = $("#cacu-btn"),        $result = $("#cacu-result"),        result = 0,        // 只允许数字及后退        filterNum = function (e) {            // 数字和后退键以外禁用            if ((e.keyCode < 48 || e.keyCode > 57) && e.keyCode !== 8) {                e.preventDefault();                return false;            }        },        // 格式化金额        formatCurrency = function (num) {            num = num.toString().replace(/\$|\,/g, ‘‘);            if (isNaN(num)) {                num = "0";            }            var sign, cents;  // 正负  小数            sign = ((Number(num) >= 0) ? ‘‘ : ‘-‘);  //   正负            num = Math.abs(num*100 + 0.50000000001);            cents = num%100;            num = Math.floor(num/100).toString();            if (cents < 10) {                cents = ‘0‘ + cents;            }            for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++) {                num = num.substring(0,num.length-(4*i+3))+‘,‘+                num.substring(num.length-(4*i+3));            }                        return (sign + num);  // + ‘.‘ + cents;        },        getCurrency = function (num) {            return num.replace(/\$|\,/g, ‘‘);        };    $input.on("keypress", function (e) {        filterNum(e);    }).on("keyup", function (e) {        var val = $(this).val();        val = formatCurrency(val);        $(this).val(val);    });    $btn.on("click", function (e) {        e.preventDefault();        var money = $input.val();        money = getCurrency(money);        result = parseInt(money/500, 10);        $result.text(result);    });})(window.jQuery);