js中常用到的验证，长度限制，验证油箱格式，两次输入密码是否相同

. 长度限制

<script>

function test()

{

if(document.a.b.value.length>50)

{

alert("不能超过50个字符！");

document.a.b.focus();

return false;

}

}

</script>

<form name=a onsubmit="return test()">

<textarea name="b" cols="40" wrap="VIRTUAL" rows="6"></textarea>

<input type="submit" name="Submit" value="check">

</form>

2. 只能是汉字

<input onkeyup="value="/oblog/value.replace(/[^\u4E00-\u9FA5]/g,'')">

3." 只能是英文

<script language=javascript>

function onlyEng()

{

if(!(event.keyCode>=65&&event.keyCode<=90))

event.returnvalue=false;

}

</script>

<input onkeydown="onlyEng();">

4. 只能是数字

<script language=javascript>

function onlyNum()

{

if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)))

//考虑小键盘上的数字键

event.returnvalue=false;

}

</script>

<input onkeydown="onlyNum();">

5. 只能是英文字符和数字

<input onkeyup="value="/oblog/value.replace(/[\W]/g,"'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">

6. 验证油箱格式

<SCRIPT LANGUAGE=javascript RUNAT=Server>

function isEmail(strEmail) {

if (strEmail.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)

return true;

else

alert("oh");

}

</SCRIPT>

<input type=text onblur=isEmail(this.value)>

7. 屏蔽关键字(这里屏蔽***和****)

<script language="javascript1.2">

function test() {

if((a.b.value.indexOf ("***") == 0)||(a.b.value.indexOf ("****") == 0)){

alert(":)");

a.b.focus();

return false;}

}

</script>

<form name=a onsubmit="return test()">

<input type=text name=b>

<input type="submit" name="Submit" value="check">

</form>

8. 两次输入密码是否相同

<FORM METHOD=POST ACTION="">

<input type="password" id="input1">

<input type="password" id="input2">

<input type="button" value="test" onclick="check()">

</FORM>

<script>

function check()

{

with(document.all){

if(input1.value!=input2.value)

{

alert("false")

input1.value = "";

input2.value = "";

}

else document.forms[0].submit();

}

}

</script>

路政管理系统应用：

//非空验证

function checkoname(){

var casename= document.all['caseInfo.casename'].value;

if(casename==""){

alert("案由不能为空！请输入执法机构");

casename.focus();

return false;

}

return true;

}

//机构简称非空验证

function checkcpunishbase(){

var cpunishbase=document.all['caseInfo.cpunishbase'].value;

if(cpunishbase==""){

alert("处罚依据不能为空！请输入机构简称");

cpunishbase.focus();

return false;

}

return true;

}

$("#password_login").bind("keydown", function (e) {

if (e.which == 13) { // 获取Enter键值

$("#code_login").focus();

}

});