一、概述javascript
二、String對象css
樣例:html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>表單驗證</title> <style type="text/css"> .right{ text-align:right;} </style> <script type="text/javascript"> function check () { var email = document.getElementById("email").value; if (email == "") { alert("Email不能爲空"); return false; } if (email.indexOf("@")== -1 || email.indexOf(".")== -1) { alert("Email格式不正確。"); return false; } var pwd = document.getElementById("pwd").value; if (pwd == ""){ alert("密碼不能爲空。"); return false; } if (pwd.length < 6) { alert("密碼長度不能小於6位。"); return false; } var repwd = document.getElementById("repwd").value; if (repwd != pwd) { alert("兩次輸入密碼不一致。"); return false; } var user = document.getElementById("user").value; if (user == "") { alert("姓名不能爲空。"); return false; } for (var i = 0 ; i < user.length ; i++) { var j = user.substring(i,i+1); if (isNaN(j) == false) { alert("姓名中不能包含數字。"); return false; } } return true; } </script> </head> <body> <table id="center" border="0" cellpadding="0" cellspacing="3"> <tr> <td colspan="2" style="padding-left:120px; font-weight:bold;">註冊休閒網</td> </tr> <form action="" method="post" onsubmit="return check();" id="myForm"> <tr> <td class="right">您的email:</td> <td><input id="email" type="text"/></td> </tr> <tr> <td class="right">輸入密碼:</td> <td><input id="pwd" type="password"/></td> </tr> <tr> <td class="right">再輸入一遍密碼:</td> <td><input id="repwd" type="password"/></td> </tr> <tr> <td class="right">您的姓名:</td> <td><input id="user" type="text"/></td> </tr> <tr> <td colspan="2" style="text-align:center"><input type="submit" value="提交"/></td> </tr> </form> </table> </body> </html>
執行結果:java
三、輸入提示特效post
四、HTML DOM: Textbox文本框對象ui
樣例:spa
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>表單驗證</title> <style type="text/css"> .right{ text-align:right;} .error{color:red;} </style> <script type="text/javascript"> function $ (id) { return document.getElementById(id); } function checkEmail () { var email = $("email").value; if (email == "") { document.getElementById("emailMsg").innerHTML = "Email不能爲空"; return false; } if (email.indexOf("@")== -1 || email.indexOf(".")== -1) { document.getElementById("emailMsg").innerHTML = "Email格式不正確。"; return false; } return true; } function checkPwd () { var pwd = document.getElementById("pwd").value; if (pwd == ""){ $("pwdMsg").innerHTML = "密碼不能爲空。"; return false; } if (pwd.length < 6) { $("pwdMsg").innerHTML = "密碼長度不能小於6位。"; return false; } return true; } function checkRepwd () { var repwd = document.getElementById("repwd").value; if (repwd != pwd) { $("repwdMsg").innerHTML = "兩次輸入密碼不一致。"; return false; } return true; } function checkUser () { var user = document.getElementById("user").value; if (user == "") { $("userMsg").innerHTML = "姓名不能爲空。"; return false; } for (var i = 0 ; i < user.length ; i++) { var j = user.substring(i,i+1); if (isNaN(j) == false) { $("userMsg").innerHTML = "姓名中不能包含數字。"; return false; } } return true; } function check () { if (checkEmail() && checkPwd() && checkRepwd() && checkUser()) { return true; } else { return false; } } </script> </head> <body> <table id="center" border="0" cellpadding="0" cellspacing="3"> <tr> <td colspan="2" style="padding-left:120px; font-weight:bold;">註冊休閒網</td> </tr> <form action="" method="post" onsubmit="return check();" id="myForm"> <tr> <td class="right">您的email:</td> <td><input id="email" type="text" onblur="checkEmail();"/><span class="error" id="emailMsg"></span></td> </tr> <tr> <td class="right">輸入密碼:</td> <td><input id="pwd" type="password" onblur="checkPwd();"/><span class="error" id="pwdMsg"></span></td> </tr> <tr> <td class="right">再輸入一遍密碼:</td> <td><input id="repwd" type="password" onblur="checkRepwd();"/><span class="error" id="repwdMsg"></span></td> </tr> <tr> <td class="right">您的姓名:</td> <td><input id="user" type="text" onblur="checkUser();"/><span class="error" id="userMsg"></span></td> </tr> <tr> <td colspan="2" style="position:relative; left:130px;"><input type="submit" value="提交"/></td> </tr> </form> </table> </body> </html>
執行結果:code