When a user logs in, there is often a real-time drop-down box. For example, entering an email will @qq com,@163. com,@sohu. com

Hello everyone , I meet you again , I'm the king of the whole stack , I've prepared for you today Idea Registration code .

As shown in the figure ,

code , As below ：<input id=”user_sn” class=”loginInput” name=”user_sn” type=”text” maxlength=”50″ value=”” onkeyup=”showContent(this,event,’zTree’,’dictSn’,true,true);” autocomplete=”off”/>

onkeyup It's basic . Indicates that the keyboard is released . Triggering event showContent（）;

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