js模仿QQ头像资料卡显示与隐藏

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我们使用QQ时经常需要查看朋友的资料卡,当我们把鼠标移入头像时,资料卡显示,并且鼠标能在头像与资料卡之间能随意移动,当鼠标移出头像或资料卡时,资料卡延时隐藏。
实质就是延时提示框问题!

这里写图片描述

首先写好布局:

<style>        div { float:left; margin:5px; }        .head { width:50px;height:50px;background-color:pink; }        .info { width:250px;height:200px;background-color:blue;display:none;  }</style><div>    <div class="head"></div>    <div class="info"></div></div>

其次js部分:
思路:
(1)鼠标移入头像,资料卡显示;鼠标移出头像,资料卡延时隐藏setTimeout
(2)鼠标移入资料卡,资料卡仍显示,并清除资料卡延时隐藏的变量
(3)鼠标移出资料卡,资料卡延时隐藏,并且此时如果在移入到头像中,资料卡扔显示,并清除资料卡延时隐藏的变量

window.onload =function(){        var oHead = document.getElementsByClassName("head")[0];        var oInfo = document.getElementsByClassName("info")[0];        var timer = null;        oHead.onmouseover=function(){            clearTimeout(timer);            oInfo.style.display="block";        };        oHead.onmouseout=function(){            timer = setTimeout(function(){                oInfo.style.display="none";            },500);         };        oInfo.onmouseover=function(){            clearTimeout(timer);            oInfo.style.display="block";        };        oInfo.onmouseout=function(){            timer = setTimeout(function(){                oInfo.style.display="none";            },500);         };};

优化代码:

oInfo.onmouseover = oHead.onmouseover=function(){            clearTimeout(timer);            oInfo.style.display="block";        }; oInfo.onmouseout = oHead.onmouseout=function(){            timer = setTimeout(function(){                oInfo.style.display="none";            },500);         };

函数封装:
注意:事件 .xx 等于 [“xx”]
第一种:函数外获取变量,调用函数,适用于一个或两个元素调用此事件

window.onload =function(){        var oHead = document.getElementsByClassName("head")[0];        var oInfo = document.getElementsByClassName("info")[0];        reminder(oHead,oInfo,"onmouseover","onmouseout");function reminder (div1,div2,event1,event2){var timer = null;         div1[event1] = div2[event1]=function(){            clearTimeout(timer);            div2.style.display="block";        };        div1[event2] = div2[event2]=function(){            timer = setTimeout(function(){                div2.style.display="none";            },500);         };        }    };

第二种:函数外获取变量,调用函数,适用于多个元素调用此事件

window.onload =function(){              var number=0;        reminder("head","info","onmouseover","onmouseout",number);        function reminder (div1,div2,event1,event2,num){        var oHead = document.getElementsByClassName(div1)[num];        var oInfo = document.getElementsByClassName(div2)[num];        var timer = null;         oHead[event1] = oInfo[event1]=function(){            clearTimeout(timer);            oInfo.style.display="block";        };        oHead[event2] = oInfo[event2]=function(){            timer = setTimeout(function(){                oInfo.style.display="none";            },500);         };        }    };

比如,一共有三个头像的话,就可以用for循环遍历为每个元素绑定事件:

var number=null;for(number=0;number<3;number++){             reminder("head","info","onmouseover","onmouseout",number);        }
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