问如何使用jQuery验证电子邮件地址？

EN

<input class"email_address_input" required type="email" id="emailAddress" />

function ContactUs($el){
    this.$el = $el;
    this.$emailAddress = this.$el.find('#emailAddress');
    this.emailValid();
    return this;
}


ContactUs.prototype.isEmail = function(email) {
  var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
  return regex.test(email);
}

ContactUs.prototype.emailValid = function($el) {
        var THIS = this;
        if (THIS.$emailAddress.val().length) {
            THIS.isEmail(THIS.$emailAddress);
        } 
  return THIS;
}