input只能輸入數字和小數點，並且只能保留小數點后兩位 - CSDN博客

1.給文本框添加一個onkeyup=’clearNoNum(this)’點擊事件 
2.建立clearNoNum方法

function clearNoNum(obj) {  
    obj.value = obj.value.replace(/[^\d.]/g,""); //清除"數字"和"."以外的字符  
        obj.value = obj.value.replace(/^\./g,""); //驗證第一個字符是數字而不是  
        obj.value = obj.value.replace(/\.{2,}/g,"."); //只保留第一個. 清除多余的  
        obj.value = obj.value.replace(".","$#$").replace(/\./g,"").replace("$#$",".");  
        obj.value = obj.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3'); //只能輸入兩個小數  

}  

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3將金額小寫轉換成大寫

function onlyNumber1(input, n) {  
    var ret = "";  
    var number =input.value;  
        if (number != ""&& number!=null&&number!="0") {  
                var unit = "仟佰拾億仟佰拾萬仟佰拾元角分",  
                str = "";  
                number += "00";  
                var point = number.indexOf('.');  
                if (point >= 0) {  
                    number = number.substring(0, point) + number.substr(point + 1, 2);  
                }  
                unit = unit.substr(unit.length - number.length);  
                for (var i = 0; i < number.length; i++) {  
                    str += '零壹貳叄肆伍陸柒捌玖'.charAt(number.charAt(i)) + unit.charAt(i);  
                }  
                ret = str.replace(/零(仟|佰|拾|角)/g, "零").replace(/(零)+/g, "零").replace(/零(萬|億|元)/g, "$1").replace(/(億)萬|(拾)/g, "$1$2").replace(/^元零?|零分/g, "").replace(/元$/g, "元") + "整";  
        }  
    var a = document.getElementsByName("MoneyCapital")[0].id;  
    document.getElementById(a).value=ret;     
    }  

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