<script> //下面的正則表達式建議各位收藏哦，項目上有可能會用得著$(function(){    $('#pass').blur(function(e) {    // alert('---------');     //密碼為八位及以上并且字母數字特殊字符三項都包括     var strongRegex = new RegExp("^(?=.{8,})(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*//W).*$", "g");      //密碼為七位及以上并且字母、數字、特殊字符三項中有兩項，強度是中等      var mediumRegex = new RegExp("^(?=.{7,})(((?=.*[A-Z])(?=.*[a-z]))|((?=.*[A-Z])(?=.*[0-9]))|((?=.*[a-z])(?=.*[0-9]))).*$", "g");     var enoughRegex = new RegExp("(?=.{6,}).*", "g");     if (false == enoughRegex.test($(this).val())) {         $('#passstrength').html('More Characters');     } else if (strongRegex.test($(this).val())) {         $('#passstrength').className = 'ok';         $('#passstrength').html('Strong!');     } else if (mediumRegex.test($(this).val())) {         $('#passstrength').className = 'alert';         $('#passstrength').html('Medium!');     } else {         $('#passstrength').className = 'error';         $('#passstrength').html('Weak!');     }     return true;  });}); </script>          <input type="password" name="pass" id="pass" /> <span id="passstrength"></span>