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）：
/***********************下是验证码对象*****************/var validation = {};validation.init = function(elename,imagesrc){ this.image = imagesrc; $('#'+elename).focusin(function(){ validation.show(elename); });}validation.image = '';validation.display=false;validation.width = '100px';validation.height = '30px';validation.div = null;validation.show = function(elename){ if(this.display==false){ //首次显示 if(this.div==null){ $('#'+elename).after('
'); this.div = $('#div_validation_'+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(); }}
使用方式：
//验证码对象初始化validation.init('validation','ajax.ashx?handle=validation');// 输入框id 验证图片地址 //隐藏validation.hide();
以上就是本文的全部内容，希望对大家的学习有所帮助。