邮箱的规则、正则表达式【亲测有效】

const Email = '1233';
const emailrule = /^([a-zA-Z]|[0-9])(\w|\-)+@[a-zA-Z0-9]+\.([a-zA-Z]{2,4})$/;
if (!emailrule.test(Email)) {
    alert("请输入有效邮箱");
    return false;
}