js验证表单大全1

附加：js验证radio是否选择

<script
language="javascript">

function checkform(obj)

{

for(i=0;i<obj.oo.length;i++)

    
    if(obj.oo[i].checked==true)
return true;

alert("请选择")

return false;    
   

}

</script>

<form id="form1" name="form1" method="post"
action=""   onsubmit="return
checkform(this)">

   <input
type="radio" name="oo" value="radiobutton" />

   <input
type="radio" name="oo" value="radiobutton" />

   <input
type="submit" name="Submit" value="提交" />

</form>

1. 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>