js实现照片墙功能实例

2019-11-20 13:12:59

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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：

<!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;