js常用函数

1、每隔4个字符串插入空格

str.replace(/\s/g,'').replace(/(.{4})/g,"$1 ");

2、只能输入两位小数

    moneyInput(e) {
        let money;
        if (/^(\d?)+(\.\d{0,2})?$/.test(e.detail.value)) { //正则验证
            money = e.detail.value;
        } else {
            money = e.detail.value.substring(0, e.detail.value.length - 1);
        }
        this.setData({
            money,
        }) 
   },