JS判斷註冊頁面輸入並提示

//判斷郵箱是否符合規範
	var p = true;
	function checkemail() {
		var val = $("#emailAd").val();
		if (!(val != null && val.trim() != '' && f)) {
			$("#emailTishi").html("<font color='red'>請輸入正確的電子郵箱地址</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;
	};
	
	//判斷驗證碼是否爲空
	
	function checkCode(){
		
			var yanzhengma = $(this).val();
			if(yanzhengma == ""){
				$("#yanzhengTishi").html("<font color='red'>請輸入驗證碼</font>");
				return false;
			}else{
				$("#yanzhengTishi").html("<font color='green'><span class='glyphicon glyphicon-ok'></span></font>");
				return true;
			}
	
	};
	
	//判斷密碼是否符合規範
	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'>密碼只能是6-20位並同時包含字母和數字</font>");
				return false;
			} else {
				$("#tishi1").html("<font color='green'><span class='glyphicon glyphicon-ok'></span></font>");
				return true;
			}
	};
	
	//判斷兩次密碼是否相同
	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'>兩次密碼不相同</font>");
				return false;
				console.log(2);
				//document.getElementById("submit").disabled = true;
			}
	};
	//不帶方法名的寫法
	$(function() {
		$("#yanzhengma").change(function() {
			var yanzhengma = $(this).val();
			if(yanzhengma == ""){
				$("#yanzhengTishi").html("<font color='red'>請輸入驗證碼</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'>密碼只能是6-20位並同時包含字母和數字</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'>兩次密碼不相同</font>");
				return false;
				console.log(2);
				//document.getElementById("submit").disabled = true;
			}
		});
		
		//判斷郵箱格式是否符合規範
		/* $("#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'>請輸入正確的電子郵箱地址</font>");
			}
		}); */
		
		
		
		
		
	});
	//點擊提交時再次驗證
	function isSubmit() {
		alert(checkemail());
		alert(checkCode());
		alert(checkPsw1());
		alert(checkPsw2());
		alert(checkemail() && checkCode() && checkPsw1() && checkPsw2());
		return checkemail() && checkCode() && checkPsw1() && checkPsw2();
	}