发布于 2017-01-27 11:06:01 | 216 次阅读 | 评论: 0 | 来源: 网友投递

这里有新鲜出炉的Javascript教程,程序狗速度看过来!

JavaScript客户端脚本语言

Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如Perl,遗留的速度问题,为客户提供更流畅的浏览效果。


这篇文章主要介绍了js实现照片墙功能的方法,以一个完整实例形式分析了js实现照片墙的css与js的相关技巧,具有一定参考借鉴价值,需要的朋友可以参考下

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;

                    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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