jquery实现表单验证，所以的验证通过后方可提交

gaoxuqing
<html>
    <head>
        <meta http-equiv="content-type" content="text/html; charset=utf-8">
        <title>Reg</title>
        <style>
            .state1{
                color:#aaa;
            }
            .state2{
                color:#000;
            }
            .state3{
                color:red;
            }
            .state4{
                color:green;
            }
        </style>
        <script src="jquery.js"></script>
        <script>
            $(function(){
 
                var ok1=false;
                var ok2=false;
                var ok3=false;
                var ok4=false;
                // 验证用户名
                $(\'input[name="username"]\').focus(function(){
                    $(this).next().text(\'用户名应该为3-20位之间\').removeClass(\'state1\').addClass(\'state2\');
                }).blur(function(){
                    if($(this).val().length >= 3 && $(this).val().length <=12 && $(this).val()!=\'\'){
                        $(this).next().text(\'输入成功\').removeClass(\'state1\').addClass(\'state4\');
                        ok1=true;
                    }else{
                        $(this).next().text(\'用户名应该为3-20位之间\').removeClass(\'state1\').addClass(\'state3\');
                    }
                     
                });
 
                //验证密码
                $(\'input[name="password"]\').focus(function(){
                    $(this).next().text(\'密码应该为6-20位之间\').removeClass(\'state1\').addClass(\'state2\');
                }).blur(function(){
                    if($(this).val().length >= 6 && $(this).val().length <=20 && $(this).val()!=\'\'){
                        $(this).next().text(\'输入成功\').removeClass(\'state1\').addClass(\'state4\');
                        ok2=true;
                    }else{
                        $(this).next().text(\'密码应该为6-20位之间\').removeClass(\'state1\').addClass(\'state3\');
                    }
                     
                });
 
                //验证确认密码
                    $(\'input[name="repass"]\').focus(function(){
                    $(this).next().text(\'输入的确认密码要和上面的密码一致,规则也要相同\').removeClass(\'state1\').addClass(\'state2\');
                }).blur(function(){
                    if($(this).val().length >= 6 && $(this).val().length <=20 && $(this).val()!=\'\' && $(this).val() == $(\'input[name="password"]\').val()){
                        $(this).next().text(\'输入成功\').removeClass(\'state1\').addClass(\'state4\');
                        ok3=true;
                    }else{
                        $(this).next().text(\'输入的确认密码要和上面的密码一致,规则也要相同\').removeClass(\'state1\').addClass(\'state3\');
                    }
                     
                });
 
                //验证邮箱
                $(\'input[name="email"]\').focus(function(){
                    $(this).next().text(\'请输入正确的EMAIL格式\').removeClass(\'state1\').addClass(\'state2\');
                }).blur(function(){
                    if($(this).val().search(/\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/)==-1){
                        $(this).next().text(\'请输入正确的EMAIL格式\').removeClass(\'state1\').addClass(\'state3\');
                    }else{                 
                        $(this).next().text(\'输入成功\').removeClass(\'state1\').addClass(\'state4\');
                        ok4=true;
                    }
                     
                });
 
                //提交按钮,所有验证通过方可提交
 
                $(\'.submit\').click(function(){
                    if(ok1 && ok2 && ok3 && ok4){
                        $(\'form\').submit();
                    }else{
                        return false;
                    }
                });
                 
            });
        </script>
    </head>
<body>
  
<form action=\'do.php\' method=\'post\' >
    用 户 名:<input type="text" name="username">
                <span class=\'state1\'>请输入用户名</span><br/><br/>
    密　　码:<input type="password" name="password">
                <span class=\'state1\'>请输入密码</span><br/><br/>
    确认密码:<input type="password" name="repass">
                <span class=\'state1\'>请输入确认密码</span><br/><br/>
    邮　　箱:<input type="text" name="email">
                <span class=\'state1\'>请输入邮箱</span><br/><br/>  
    <a href="javascript:;"><img class=\'submit\' type=\'image\' src=\'./images/reg.gif\' /></a>
</form>
</body>
<html>
    <head>
        <meta http-equiv="content-type" content="text/html; charset=utf-8">
        <title>Reg</title>
        <style>
            .state1{
                color:#aaa;
            }
            .state2{
                color:#000;
            }
            .state3{
                color:red;
            }
            .state4{
                color:green;
            }
        </style>
        <script src="jquery.js"></script>
        <script>
            $(function(){
 
                var ok1=false;
                var ok2=false;
                var ok3=false;
                var ok4=false;
                // 验证用户名
                $(\'input[name="username"]\').focus(function(){
                    $(this).next().text(\'用户名应该为3-20位之间\').removeClass(\'state1\').addClass(\'state2\');
                }).blur(function(){
                    if($(this).val().length >= 3 && $(this).val().length <=12 && $(this).val()!=\'\'){
                        $(this).next().text(\'输入成功\').removeClass(\'state1\').addClass(\'state4\');
                        ok1=true;
                    }else{
                        $(this).next().text(\'用户名应该为3-20位之间\').removeClass(\'state1\').addClass(\'state3\');
                    }
                     
                });
 
                //验证密码
                $(\'input[name="password"]\').focus(function(){
                    $(this).next().text(\'密码应该为6-20位之间\').removeClass(\'state1\').addClass(\'state2\');
                }).blur(function(){
                    if($(this).val().length >= 6 && $(this).val().length <=20 && $(this).val()!=\'\'){
                        $(this).next().text(\'输入成功\').removeClass(\'state1\').addClass(\'state4\');
                        ok2=true;
                    }else{
                        $(this).next().text(\'密码应该为6-20位之间\').removeClass(\'state1\').addClass(\'state3\');
                    }
                     
                });
 
                //验证确认密码
                    $(\'input[name="repass"]\').focus(function(){
                    $(this).next().text(\'输入的确认密码要和上面的密码一致,规则也要相同\').removeClass(\'state1\').addClass(\'state2\');
                }).blur(function(){
                    if($(this).val().length >= 6 && $(this).val().length <=20 && $(this).val()!=\'\' && $(this).val() == $(\'input[name="password"]\').val()){
                        $(this).next().text(\'输入成功\').removeClass(\'state1\').addClass(\'state4\');
                        ok3=true;
                    }else{
                        $(this).next().text(\'输入的确认密码要和上面的密码一致,规则也要相同\').removeClass(\'state1\').addClass(\'state3\');
                    }
                     
                });
 
                //验证邮箱
                $(\'input[name="email"]\').focus(function(){
                    $(this).next().text(\'请输入正确的EMAIL格式\').removeClass(\'state1\').addClass(\'state2\');
                }).blur(function(){
                    if($(this).val().search(/\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/)==-1){
                        $(this).next().text(\'请输入正确的EMAIL格式\').removeClass(\'state1\').addClass(\'state3\');
                    }else{                 
                        $(this).next().text(\'输入成功\').removeClass(\'state1\').addClass(\'state4\');
                        ok4=true;
                    }
                     
                });
 
                //提交按钮,所有验证通过方可提交
 
                $(\'.submit\').click(function(){
                    if(ok1 && ok2 && ok3 && ok4){
                        $(\'form\').submit();
                    }else{
                        return false;
                    }
                });
                 
            });
        </script>
    </head>
<body>
  
<form action=\'do.php\' method=\'post\' >
    用 户 名:<input type="text" name="username">
                <span class=\'state1\'>请输入用户名</span><br/><br/>
    密　　码:<input type="password" name="password">
                <span class=\'state1\'>请输入密码</span><br/><br/>
    确认密码:<input type="password" name="repass">
                <span class=\'state1\'>请输入确认密码</span><br/><br/>
    邮　　箱:<input type="text" name="email">
                <span class=\'state1\'>请输入邮箱</span><br/><br/>  
    <a href="javascript:;"><img class=\'submit\' type=\'image\' src=\'./images/reg.gif\' /></a>
</form>
</body>

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