给你一个写好的,你参考一下

<html>

<head>

<title></title>

<script type="text/javascript">

function init(){

document.form1.username.focus();

}

function blu(){

var space=document.form1.username.value;

if(space==""){

var sp=document.getelementbyid("sp").innerhtmL="用户不能为空";

}

else {

document.getelementbyid("sp").innerhtmL="";

}

}

function funpsd(){

var psd=document.form1.psd.value

if(psd==""){

document.getelementbyid("sp1").innerhtmL="密码不能为空";

}

else if(psd.length<6 || psd.length>15){

document.getelementbyid("sp1").innerhtmL="密码不能小于6位或不能大于15位";

}

else if(isnan(psd)){

document.getelementbyid("sp1").innerhtmL="密码必须是数字";

}

else {

document.getelementbyid("sp1").innerhtmL="";

}

}

function funcpsd(){

var psd1=document.form1.psd.value;

var psd2=document.form1.cpsd.value; //变量赋值在前

if(psd1!=psd2){

document.getelementbyid("sp2").innerhtmL="密码不一致,请重新输入";

document.form1.psd.select();

//psd2="" //把变量清空,但document.form1.cpsd.value还是原来的值,并没有清空document.form1.cpsd.value的值

document.form1.cpsd.value="";

}

else{

document.getelementbyid("sp2").innerhtmL="";

}

}

function funqq(){

var qq=document.form1.qq.value;

if(isnan(qq)){

document.getelementbyid("sp3").innerhtmL="qq必须是数字";

}

else if(qq.length<=7 || qq.length>=12){

document.getelementbyid("sp3").innerhtmL="qq不能小于8位或大于12位";

}

else {

document.getelementbyid("sp3").innerhtmL="";

}

}

</script>

</head>

<body οnlοad="init();">

<form name="form1" method="post" action="">

<div>

<label for="username">

用户:<input type="text" name="username" id="username" οnblur="blu();" value="" /><span id="sp"></span>

</label>

</div>

<div>

<label for="psd1">

密码:<input type="password" name="psd" id="psd1" οnblur="funpsd();" value="" /><span id="sp1"></span>

</label>

</div>

<div>

<label for="cpsd1">

确认密码:<input type="password" name="cpsd" id="cpsd1" οnblur="funcpsd();" value="" /><span id="sp2"></span>

</label>

</div>

<div>

<label for="sex">

性别:<input type="radio" name="sex" value="男" checked="checked">男<input type="radio" name="sex" value="女">女

</label>

</div>

<div>

年龄:

<select name="sel">

<option value="18">18</option>

<option value="19">19</option>

<option value="20">20</option>

<option value="21">21</option>

<option value="22">22</option>

</select>

</div>

<div>

QQ:<input type="text" value="" name="qq" οnblur="funqq();" /><span id="sp3"></span>

</div>

<div>

<input type="submit" value="提交" />

<input type="reset" value="重置" />

</div>

</form>

</body>

</html>

来源:微点阅读  https://www.weidianyuedu.com

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