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js實現照片牆功能實例
編輯:關於JavaScript     

本文實例講述了js實現照片牆功能的方法。分享給大家供大家參考。具體實現方法如下:
復制代碼 代碼如下:<!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照片牆</title>
        <meta http-equiv="X-UA-Compatible" content="edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <meta name="Keywords" content="js照片牆">
        <meta name="description" content="js照片牆">
        <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;
                //布局轉換

                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++){
                        //增加隨機位置的情況
                       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;
                    }
                }
                //檢測是否有碰撞
                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;
                    }
                }
                //尋找最近的節點
                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>

希望本文所述對大家的javascript程序設計有所幫助。

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