文档介绍：Js 验证 js 验证表单大全 1. 长度限制<script> function test() { if(>50) { alert(" 不能超过 50 个字符! "); (); 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/(/[^\u4E00-\u9FA5]/g,'') "> 3." 只能是英文<script language=javascript> function onlyEng() { if(!(>=65&&<=90)) =false; } </script> <input onkeydown="onlyEng();"> 4. 只能是数字<script language=javascript> function onlyNum() { if(!((>=48&&<=57)||( >=96&&<=105))) // 考虑小键盘上的数字键 =false; } </script> <input onkeydown="onlyNum();"> 5. 只能是英文字符和数字<input onkeyup="value="/oblog/(/[\W]/g,"'') "onbeforepaste="('text',clipboardData. getData('text').replace(/[^\d]/g,''))"> 6. 验证油箱格式<SCRIPT LANGUAGE=javascript RUNAT=Server> function isEmail(strEmail) { if ((/^\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()> 7. 屏蔽关键字( 这里屏蔽*** 和****) <script language=""> function test() { if(( ("***") == 0)||( ("****") == 0)){ alert(":)"); (); 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(){ if(!=) { alert("false") = ""; = ""; } else [0].submit(); }} </script> 够了吧:) 屏蔽右键很酷 oncontextmenu="return false" ondragstart="return false" onselects