JS判断注册页面输入并提示

//判断邮箱是否符合规范
	var p = true;
	function checkemail() {
		var val = $("#emailAd").val();
		if (!(val != null && val.trim() != '' && f)) {
			$("#emailTishi").html("<font color='red'>请输入正确的电子邮箱地址</font>");
			return false;
		}
		var params = {
			'email' : val,
		};
		var url = "/checkEmail"
		$.post(url, params, function(data) {
			/* f = data.f; */
			p = data.f;
			
				$("#emailTishi").html(
						"<font color='red'>" + data.message + "</font>");
			
		}, "json");
		return p;
	};
	
	//判断验证码是否为空
	
	function checkCode(){
		
			var yanzhengma = $(this).val();
			if(yanzhengma == ""){
				$("#yanzhengTishi").html("<font color='red'>请输入验证码</font>");
				return false;
			}else{
				$("#yanzhengTishi").html("<font color='green'><span class='glyphicon glyphicon-ok'></span></font>");
				return true;
			}
	
	};
	
	//判断密码是否符合规范
	function checkPsw1(){
			var patrn = /^[a-zA-Z0-9]+$/;
			
			console.log((/\d/.test($(this).val()) && /[a-zA-Z]/.test($(this).val()) && patrn.test($(this).val())));
			if (!(/\d/.test($(this).val()) && /[a-zA-Z]/.test($(this).val()) && patrn.test($(this).val()))) {
				$("#tishi1").html("<font color='red'>密码只能是6-20位并同时包含字母和数字</font>");
				return false;
			} else {
				$("#tishi1").html("<font color='green'><span class='glyphicon glyphicon-ok'></span></font>");
				return true;
			}
	};
	
	//判断两次密码是否相同
	function checkPsw2(){
			var pwd1 = $("#pwd1").val();
			var pwd2 = $(this).val();
			if (pwd1 == pwd2) {
				$("#tishi2").html("<font color='green'><span class='glyphicon glyphicon-ok'></span></font>");
				return true;
				console.log(1);
				//document.getElementById("submit").disabled = false;
			} else {
				$("#tishi2").html("<font color='red'>两次密码不相同</font>");
				return false;
				console.log(2);
				//document.getElementById("submit").disabled = true;
			}
	};
	//不带方法名的写法
	$(function() {
		$("#yanzhengma").change(function() {
			var yanzhengma = $(this).val();
			if(yanzhengma == ""){
				$("#yanzhengTishi").html("<font color='red'>请输入验证码</font>");
				return false;
			}else{
				$("#yanzhengTishi").html("<font color='green'><span class='glyphicon glyphicon-ok'></span></font>");
				return true;
			}
		});

		$("#pwd1").change(function() {
			var patrn = /^[a-zA-Z0-9]+$/;
			
			console.log((/\d/.test($(this).val()) && /[a-zA-Z]/.test($(this).val()) && patrn.test($(this).val())));
			if (!(/\d/.test($(this).val()) && /[a-zA-Z]/.test($(this).val()) && patrn.test($(this).val()))) {
				$("#tishi1").html("<font color='red'>密码只能是6-20位并同时包含字母和数字</font>");
				return false;
			} else {
				$("#tishi1").html("<font color='green'><span class='glyphicon glyphicon-ok'></span></font>");
				return true;
			}
		});
		
		$("#pwd2").change(function() {
			var pwd1 = $("#pwd1").val();
			var pwd2 = $(this).val();
			if (pwd1 == pwd2) {
				$("#tishi2").html("<font color='green'><span class='glyphicon glyphicon-ok'></span></font>");
				return true;
				console.log(1);
				//document.getElementById("submit").disabled = false;
			} else {
				$("#tishi2").html("<font color='red'>两次密码不相同</font>");
				return false;
				console.log(2);
				//document.getElementById("submit").disabled = true;
			}
		});
		
		//判断邮箱格式是否符合规范
		/* $("#emailAd").change(function() {
			var emailAd = $(this).val();
			var re=/^(\w-*\.*)+@(\w-?)+(\.\w{2,})+$/;
			if(re.test(emailAd)){
				$("#emailTishi").html("<font color='green'><span class='glyphicon glyphicon-ok'></span></font>");
			}
			else{
				$("#emailTishi").html("<font color='red'>请输入正确的电子邮箱地址</font>");
			}
		}); */
		
		
		
		
		
	});
	//点击提交时再次验证
	function isSubmit() {
		alert(checkemail());
		alert(checkCode());
		alert(checkPsw1());
		alert(checkPsw2());
		alert(checkemail() && checkCode() && checkPsw1() && checkPsw2());
		return checkemail() && checkCode() && checkPsw1() && checkPsw2();
	}