原生js限制input输入金额

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>JS限制文本框输入金额并保留两位小数</title>
<script type="text/javascript">
/**
* 实时动态强制更改用户录入
* arg1 inputObject
**/
function amount(th){
var regStrs = [
['^0(\\d+)$', '$1'], //禁止录入整数部分两位以上，但首位为0
['[^\\d\\.]+$', ''], //禁止录入任何非数字和点
['\\.(\\d?)\\.+', '.$1'], //禁止录入两个以上的点
['^(\\d+\\.\\d{2}).+', '$1'] //禁止录入小数点后两位以上
];
for(var i=0; i<regStrs.length; i++){
var reg = new RegExp(regStrs[i][0]);
th.value = th.value.replace(reg, regStrs[i][1]);
}
}
/**
* 录入完成后，输入模式失去焦点后对录入进行判断并强制更改，并对小数点进行0补全
* arg1 inputObject
**/
function overFormat(th){
var v = th.value;
if(v === ''){
v = '0.00';
}else if(v === '0'){
v = '0.00';
}else if(v === '0.'){
v = '0.00';
}else if(/^0+\d+\.?\d*.*$/.test(v)){
v = v.replace(/^0+(\d+\.?\d*).*$/, '$1');
v = inp.getRightPriceFormat(v).val;
}else if(/^0\.\d$/.test(v)){
v = v + '0';
}else if(!/^\d+\.\d{2}$/.test(v)){
if(/^\d+\.\d{2}.+/.test(v)){
v = v.replace(/^(\d+\.\d{2}).*$/, '$1');
}else if(/^\d+$/.test(v)){
v = v + '.00';
}else if(/^\d+\.$/.test(v)){
v = v + '00';
}else if(/^\d+\.\d$/.test(v)){
v = v + '0';
}else if(/^[^\d]+\d+\.?\d*$/.test(v)){
v = v.replace(/^[^\d]+(\d+\.?\d*)$/, '$1');
}else if(/\d+/.test(v)){
v = v.replace(/^[^\d]*(\d+\.?\d*).*$/, '$1');
ty = false;
}else if(/^0+\d+\.?\d*$/.test(v)){
v = v.replace(/^0+(\d+\.?\d*)$/, '$1');
ty = false;
}else{
v = '0.00';
}
}
th.value = v;
}
</script>
</head>
<body>
<input type="text" name="city" value="" onKeyUp="amount(this)" onBlur="overFormat(this)" />
</body>
</html>

原生js限制input输入金额

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