html
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8">
</head>
<body>
<form method="post" action="http://www.baidu.com" onsubmit="return check()" >
姓名:<input type="text" name="uName" id="uName" onblur="checkName();"><span class="message"></span><br/>
密码:<input type="password" name="uPwd" id="uPwd" onblur="checkPwd()"><span class="message" ></span><br/>
<input type="submit" value="登录">
</form>
<script type="text/javascript" src="login.js"></script>
</body>
</html>
JS
function checkName(){ var uName=document.getElementById("uName") var name=uName.value; var message=uName.nextSibling; if(name.length==0){ message.innerHTML="用户名不能为空" // this.focus(); return false; }else if (name.length<4||name.length>10){ message.innerHTML="用户名长度为4-10位之间" return false; }else{ message.innerHTML="用户名输入正确" return true; } } function checkPwd(){ var uPwd=document.getElementById("uPwd"); var pwd=uPwd.value; var message=uPwd.nextSibling; if(pwd.length==0){ message.innerText="用户密码不能为空" return false; }else{ message.innerText="用户密码输入正确" return true; } } function check(){ if(checkName()&&checkPwd()){ //发送ajax //操作成功后 返回true 否则返回false } }
可以通过check这个函数的返回结果控制表单的跳转，为true 才跳转