Basic explanation of jQuery event binding function

This article mainly introduces the event binding function implemented by jQuery. It analyzes the implementation and usage of jQuery event binding based on simple form verification examples. Friends who need it can refer to it. I hope it can help everyone.

HTML text:

##

用户名：<input type="text" value="邮箱/用户名/手机号" id="login"/><br>
密　码：<input type="password" id="passwd"><br>
<input type="button" value="登陆" id="operation"/>

Javascript operation code:

//获取焦点事件
$("#login").focus(function(){
 var $realValue=$(this).val();
 var $defaultVale=this.defaultValue;
 if($realValue==$defaultVale){
  $(this).val("");
 }else{
  $(this).val($realValue);
 }
});
//失去焦点事件
$("#login").blur(function(){
 var $realValue=$(this).val();
 var $defaultVale=this.defaultValue;
 if($realValue==""){
  $(this).val($defaultVale);
 }else{
  $(this).val($realValue);
 }
});
//登陆绑定事件：实际项目中一般使用md5进行单向加密，然后传递后台验证身份
$("#operation").click(function(){
var $realValue=$("#login").val();
var $passwd=$("#passwd").val();
if($realValue=="squirrel"||$passwd=="xiaoyang"){
  alert("验证成功");
}else{
  alert("验证失败");
}
});

Effect:

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