JavaScript判斷E-mail地址是否合法，javascripte-mail

JavaScript判斷E-mail地址是否合法，javascripte-mail

<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">編寫自訂的JavaScript函數checkEmail(),在該函數中首先判斷E-mail文字框是否為空白,然後在應用Regex判斷E-mail地址是否合法,如果不合法提示使用者</span>

<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);"></span><pre name="code" class="javascript"><script type="text/javascript">  function checkEmail(){    var email = document.getElementById("email");if(email.value == null || email.value == ""){alert("請輸入E-mail地址!");email.focus();return;}var regExp = /\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/;if(!regExp.test(email.value)){alert("您輸入的E-mail地址不正確!");email.focus();return;}    }  </script><span style="white-space:pre"></span>