先看效果图：

要求：当输入框获得焦点时，自动显示验证图片。

代码如下（学习而已，仅供参考）：

');
this.div = $('#divvalidation'+eleName);
this.div.css('position','absolute');
this.div.css('cursor','pointer');
this.div.css('border','1px solid #CCC');
this.div.css('background-color','#FFF');
this.div.css('background-position','center');
this.div.css('background-repeat','no-repeat');
this.div.css('height',this.height);
this.div.css('width',this.width);
var objOffset = $('#'+eleName).offset();
objOffset.top+=$('#'+eleName).height()+6;
this.div.offset(objOffset);
this.div.css('background-image','url('+Validation.image+'&_t='+new Date()+')');
this.div.css('display','inline-block');
this.display = true;
//点击更换
this.div.click(function(){
Validation.div.css('background-image','url('+Validation.image+'&_t='+new Date()+')');
});
}
else{
this.div.css('background-image','url('+Validation.image+'&_t='+new Date()+')');
this.display = true;
this.div.css('display','inline-block');
}
}
}
Validation.hide =function(){
if(this.display==true){
this.display = false;
this.div.hide();
}
}