JavaScript判断E-mail地址是否合法

JavaScript判断E-mail地址是否合法       

        分类：            JavaScript 2015-06-10 09:03 358人阅读 评论(0) 收藏 举报

正则表达式 javascript

"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

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

"font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);">

"code" class="javascript">
    <span class="string">"text/javascript"</span><span>>  </span></span></li> 
     <li><span>        <span class="keyword">function</span><span> checkEmail(){  </span> </span></li> 
     <li class="alt"><span>            <span class="keyword">var</span><span> email = document.getElementById(</span><span class="string">"email"</span><span>);  </span></span></li> 
     <li><span>            <span class="keyword">if</span><span>(email.value == </span> <span class="keyword">null</span><span> || email.value == </span><span class="string">""</span><span>){  </span></span></li> 
     <li class="alt"><span>                alert(<span class="string">"请输入E-mail地址!"</span><span>);  </span></span></li> 
     <li><span>                email.focus();  </span></li> 
     <li class="alt"><span>                <span class="keyword">return</span><span>;  </span></span></li> 
     <li><span>            }  </span></li> 
     <li class="alt"><span>            <span class="keyword">var</span><span> regExp = /\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/;  </span></span></li> 
     <li><span>            <span class="keyword">if</span><span>(!regExp.test(email.value)){  </span></span></li> 
     <li class="alt"><span>                alert(<span class="string">"您输入的E-mail地址不正确!"</span><span>);  </span></span></li> 
     <li><span>                email.focus();  </span></li> 
     <li class="alt"><span>                <span class="keyword">return</span><span>;  </span></span></li> 
     <li><span>            }  </span></li> 
     <li class="alt"><span>        }  </span></li> 
     <li><span>

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