JavaScript判断E-mail地址是否合法

JavaScript判断E-mail地址是否合法
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JavaScript2015-06-10 09:03358人阅读评论(0)收藏举报
正则表达式javascript

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<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">编写自定义的JavaScript函数checkEmail(),在该函数中首先判断E-mail文本框是否为空,然后在应用正则表达式判断E-mail地址是否合法,如果不合法提示用户</span>

<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">编写自定义的JavaScript函数checkEmail(),在该函数中首先判断E-mail文本框是否为空,然后在应用正则表达式判断E-mail地址是否合法,如果不合法提示用户</span>

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<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("请输入E-mail地址!");

email.focus();
return;

}
var regExp = /\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/;

if(!regExp.test(email.value)){

alert("您输入的E-mail地址不正确!");

email.focus();
return;

}
}
</script>

<span style="white-space:pre"> </span>