JS retains two decimal places for input number verification code

This time I will bring you the JS retaining two decimal places input number verification code, JS retaining two decimal places input number verification What are the precautions, the following is a practical case, let's take a look .

Input input format verification:

$(function(){
var data = $.trim($("#inputId").val());
//此正则表达式验证小数位是否超过两位，小数可为1位 || 2位 || 整数
if(!(/^\d+(\.\d{1,2})?$/.test(data ) || /^\d$/.test(data ) )){
alert("输入金额格式不对!最高精确到分");
return ;
}
//写入对应位置
$(".htmlTextClass").innerText(toDecimal2(data ));
});
//强制小数位保留方法
function toDecimal2(x) {
var f = parseFloat(x);
//isNaN() 函数用于检查其参数是否是非数字值,如果 x 是特殊的非数字值 NaN（或者能被转换为这样的值），返回的值就是 true。如果 x 是其他值,则返回 false。
if (isNaN(f)) {
return false;
}
var f = Math.round(x*100)/100; //round() 方法可把一个数字舍入为最接近的整数
var s = f.toString();
var rs = s.indexOf('.');
if (rs < 0) {
rs = s.length;
s += '.';
}
while (s.length <= rs + 2) {
s += '0';
}
return s;
}

Supplement: Let’s look at the solution to retain two decimal places in js

var a = 123.456;
a = a..toFixed(2);
alert(a);//结果：123.46

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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