js实现照片墙功能实例

作者：bea

本文实例讲述了js实现照片墙功能的方法。分享给大家供大家参考。具体实现方法如下：

代码如下:

<!doctype html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:html5="http://www.w3.org/1999/xhtml">
    <head>
        <meta charset="utf-8">
        <title>js照片墙</title>
        <meta http-equiv="X-UA-Compatible" content="edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <meta name="Keywords" content="js照片墙">
        <meta name="description" content="js照片墙">
        <link href="css/style.css" rel="stylesheet">
        <script src="move.js"></script>
        <style>
            *{padding: 0; margin: 0;}
            li{list-style: none;}
            ul{width: 660px; height:510px; background:#ccc;margin: 20px auto;}
            li{width:200px; height: 150px; margin: 10px; float: left; }
        </style>
        <script>
        /*
            var arr=['a','b','c','d','e','d','f'];
            var pos = arr.lastIndexOf('d');
            alert(pos);
            */
            window.onload=function(){
                var aLi = document.querySelectorAll('li');
                var oInput = document.querySelector('#btn');
                var pos = [];
                var len= aLi.length;
                var izIndex= 2;
                //布局转换

                for(var i=0;i<len;i++){                     pos.push([aLi[i].offsetLeft,aLi[i].offsetTop]);                 }                 for(var i=0;i<len;i++){                     aLi[i].style.left=pos[i][0]+'px';                     aLi[i].style.top=pos[i][1]+'px';                     aLi[i].style.position = 'absolute';                     aLi[i].style.margin = '0px';                 }                 for(var i=0;i<len;i++){                      aLi[i].index = i;                      setDrag(aLi[i]);                 }                 oInput.onclick=function(){                     var randomArr = [0,1,2,3,4,5,6,7,8];                     randomArr.sort(function(num1,num2){                         return Math.random()-0.5;                     })                     for(var i=0;i<len;i++){                         //增加随机位置的情况                        startMove(aLi[i],{left:pos[randomArr[i]][0],top:pos[randomArr[i]][1]});                        //修正索引                        aLi[i].index = randomArr[i];                     }                 }                 //拖拽                 function setDrag(obj){                     obj.onmousedown =function(ev){                         izIndex++;                         obj.style.zIndex= izIndex;                         var ev = ev || event;                         var disX = ev.clientX - obj.offsetLeft;                         var disY = ev.clientY - obj.offsetTop;                         document.onmousemove=function(ev){                             var ev = ev || event;                             obj.style.left = ev.clientX- disX +'px';                             obj.style.top = ev.clientY - disY +'px';                             for(var i=0; i<len; i++){                                 aLi[i].style.border='none';                             }                             var nL = nearLi(obj);                             if(nL){                                 nL.style.border='2px solid red';                             }                                                  }                         document.onmouseup= function(){                             document.onmousemove = null;                             document.onmouseup = null;                             var nL = nearLi(obj);                             if(nL){                                 nL.style.border='2px solid red';                                 startMove(obj,{left:pos[nL.index][0],top:pos[nL.index][1]});                                 startMove(nL,{left:pos[obj.index][0],top:pos[obj.index][1]});                                 var tmp =nL.index;                                 nL.index = obj.index;                                 obj.index = tmp;                                 nL.style.border='';                             }else{                                 startMove(obj,{left:pos[obj.index][0],top:pos[obj.index][1]});                             }                         }                         return false;                     }                 }                 //检测是否有碰撞                 function isDump(obj1,obj2){                     var l1= obj1.offsetLeft;                     var r1= l1+obj1.offsetWidth;                     var t1= obj1.offsetTop;                     var b1 =obj1.offsetHeight +t1;
                    var l2= obj2.offsetLeft;                     var r2= l2+obj2.offsetWidth;                     var t2= obj2.offsetTop;                     var b2 =obj2.offsetHeight +t2;                     if(b2<t1 || l2>r1 || r2<l1 || t2>b1){                         return false;                     }else{                         return true;                     }                 }                 //寻找最近的节点                 function nearLi(obj){                     var index= -1;                     var value =9999;                    for(var i=0; i<len; i++){                         if(isDump(obj,aLi[i]) && obj !=aLi[i]){                             var c = getDis(obj,aLi[i]);                             if(c <value){                                 value = c;                                 index = i;                             }                         }                     }                     if(index !=-1){                         return aLi[index];                     }else{                         return false;                     }                 }                 function getDis(obj1,obj2){                     var x = obj1.offsetLeft - obj2.offsetLeft;                     var y = obj1.offsetTop - obj2.offsetTop;                     return Math.sqrt(Math.pow(x,2)+Math.pow(y,2));                 }             }         </script>     </head>     <body>     <button id="btn">click</button>         <ul>             <li><img src="1l.jpg" width="200px" height="150px"></li>             <li><img src="2l.jpg" width="200px" height="150px"></li>             <li><img src="3l.jpg" width="200px" height="150px"></li>             <li><img src="4l.jpg" width="200px" height="150px"></li>             <li><img src="5l.jpg" width="200px" height="150px"></li>             <li><img src="6l.jpg" width="200px" height="150px"></li>             <li><img src="1l.jpg" width="200px" height="150px"></li>             <li><img src="2l.jpg" width="200px" height="150px"></li>             <li><img src="4l.jpg" width="200px" height="150px"></li>         </ul>     </body> </html>

希望本文所述对大家的javascript程序设计有所帮助。

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js实现照片墙功能实例

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