Let’s take a look at the code in the previous section first
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style type="text/css">
*{margin:0;padding:0;}
#div{width:410px;height:400px;background:#46a3ff;padding-left:16px;
padding-top:20px;}
input{
outline:none;
box-sizing:border-box;padding-left:15px;}
textarea{
outline:none;resize : none;
box-sizing:border-box;padding-left:15px;padding-top:5px;}
.name{width:200px;height:30px;margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;}
.pwd{width:200px;height:30px;
margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;}
.email{width:200px;height:30px;margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;}
.txt{
width:280px;height:70px;margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;}
.sub{width:100px;height:30px;padding-left:0px;
border:none;
border-radius:5px;background:#ffd0ff;}
.sub:hover{background:#ffaad5;}
.div{
width:200px;height:30px;margin:0 auto;box-sizing:border-box;padding-left:45px;padding-top:5px;color:#8600ff;font-weight:bold;}
</style>
</head>
<body>
<div id="div">
<form>
<label>用户名:</label>
<input type="text" class="name" id="name">
<div id="sp" class="div"></div>
<label>密 码:</label>
<input type="password" class="pwd" id="pwd">
<div id="sp1" class="div"></div>
<label>邮 箱:</label>
<input type="text" class="email" id="email">
<div id="sp2" class="div"></div>
<label>爱 好:</label>
<textarea rows="5" cols="40" class="txt" id="txt"></textarea>
<div id="sp3" class="div"></div>
<input type="button" class="sub" value="注册" id="sub">
</form>
</div>
</body>
</html>Let’s first look at verifying the user name:
var sub = document.getElementById('sub');
Sub.onClight = Function () {
// Verify whether the user name is empty, if it is empty, give prompt information
var val = document.getElementByid ('name'). if(val == ""){
document.getElementById("sp").innerHTML = "Please enter the user name!";
}
}
var sub = document.GetelementByid ('Sub');
Sub.Onclick = Function () {
// Verify whether the user name is empty, if it is empty, give prompt information
var val = document.getElementById('name').value;
If(val == ""){
document.getElementById("sp").innerHTML = "Please enter your username!";
}
// Verify whether the password is empty, for the empty, give a prompt message
var value = document.GetelementByid ('pwd'). Value;
IF (Val1 == "") {## {##) #DOCUMENT.GetelementByid ("SP1"). InnerHtml = "Please enter the password!"; ##}
// Verify whether the mailbox is empty
var val2 = document.getElementByid ('email'). Value;
if (val2 == "") {
DCUMENT.GetelementByid ("SP2"). Innerhtml = "Please enter the mailbox!"
}
// var val3 = document.getElementById('txt').value;
If(val3 == ""){
document.getElementById("sp3").innerHTML = "Please enter the content!";
} Next Section
