发布于 2017-04-21 10:46:19 | 93 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javascript实现瀑布流自适应遇到的问题及解决方案,需要的朋友可以参考下

这几天看了Amy老师的用javascript实现瀑布流,我跟着把代码敲出来。发现这样写只能第一次载入时适应屏幕,以后改变窗口大小就不能做到自适应了。

于是我想到了用window.onresize来使得瀑布流函数从新加载来达到目的,



window.onload=function(){

    //瀑布流函数

    waterfall('content','box');

    //模拟数据加载

    var dataInt = {"data":[{"src":"01.jpg"},{"src":"02.jpg"},{"src":"03.jpg"},{"src":"04.jpg"},{"src":"05.jpg"},{"src":"06.jpg"},{"src":"07.jpg"}]}

    //当屏幕大小改变时从新执行瀑布流函数 达到从新适应的作用

    window.onresize=function(){

//      waterfall('content','box');

       setTimeout(function() {waterfall('content','box');}, 200);

    }

    window.onscroll=function(){

        if(checkScroll()){

            var oparent = document.getElementById('content');

            //将熏染的数据添加入html中

            for(var i=0;i<dataInt.data.length;i++){

                var obox = document.createElement("div");

                obox.className = "box";

                oparent.appendChild(obox);

                var opic = document.createElement("div");

                opic.className = "pic";

                obox.appendChild(opic);

                var oImg = document.createElement("img");

                oImg.src="img/"+dataInt.data[i].src;

                opic.appendChild(oImg);

            }

                waterfall('content','box');

        }

    }

}

当屏幕缩小时是可以的,但是从缩小的放大就出现了BUG

看没看到后面几列的顶部回不来了,
于是我打开开发工具看是怎么回事,

第3 4 5个div中不应该有style,是因为缩小的时候给他添加上去的,而放大了他没有清除所以保留下来了就会出现这个样子于是:我在瀑布流函数里加了句aBox[i].style.cssText ='';使得每次进来都清空style



function waterfall(parent,box){

    //将content下所有class box取出来

    var aParent = document.getElementById(parent);

    var aBox = getBclass(aParent,box);

    //获取盒子的宽度

    var aBoxW = aBox[0].offsetWidth;

    //用浏览器的可是宽度除以box宽度 得到列数

    var cols = Math.floor(document.documentElement.clientWidth/aBoxW);

    //设定 content的宽度 和居中

    aParent.style.cssText = 'width:'+aBoxW*cols+'px;height:auto;position: relative; margin:0 auto;padding-right:15px';

    //创建每一列的高度数组

    var hArr=[];

    for(var i=0; i<aBox.length;i++){

        aBox[i].style.cssText ='';

        if(i<cols){

            hArr.push(aBox[i].offsetHeight); 

        }else{

            var minH = Math.min.apply(null,hArr);

            var index = getMinIndex(hArr,minH);  //找出高最矮的 索引值

            //console.log(aBoxW);

            aBox[i].style.position = 'absolute';

            aBox[i].style.top = minH+'px';

            aBox[i].style.left = aBoxW*index+'px';

            hArr[index]+=aBox[i].offsetHeight;

        }

    }

}

这样就解决了缩小后回不来的BUG,可以正常自适应了

最后我把整个的javascript 贴出来



window.onload=function(){

    //瀑布流函数

    waterfall('content','box');

    //模拟数据加载

    var dataInt = {"data":[{"src":"01.jpg"},{"src":"02.jpg"},{"src":"03.jpg"},{"src":"04.jpg"},{"src":"05.jpg"},{"src":"06.jpg"},{"src":"07.jpg"}]}

    //当屏幕大小改变时从新执行瀑布流函数 达到从新适应的作用

    window.onresize=function(){

//      waterfall('content','box');

       setTimeout(function() {waterfall('content','box');}, 200);

    }

    window.onscroll=function(){

        if(checkScroll()){

            var oparent = document.getElementById('content');

            //将熏染的数据添加入html中

            for(var i=0;i<dataInt.data.length;i++){

                var obox = document.createElement("div");

                obox.className = "box";

                oparent.appendChild(obox);

                var opic = document.createElement("div");

                opic.className = "pic";

                obox.appendChild(opic);

                var oImg = document.createElement("img");

                oImg.src="img/"+dataInt.data[i].src;

                opic.appendChild(oImg);

            }

                waterfall('content','box');

        }

    }

 

}

function waterfall(parent,box){

    //将content下所有class box取出来

    var aParent = document.getElementById(parent);

    var aBox = getBclass(aParent,box);

     

    //获取盒子的宽度

    var aBoxW = aBox[0].offsetWidth;

    //用浏览器的可是宽度除以box宽度 得到列数

    var cols = Math.floor(document.documentElement.clientWidth/aBoxW);

    //设定 content的宽度 和居中

    aParent.style.cssText = 'width:'+aBoxW*cols+'px;height:auto;position: relative; margin:0 auto;padding-right:15px';

    //创建每一列的高度数组

    var hArr=[];

    for(var i=0; i<aBox.length;i++){

        aBox[i].style.cssText ='';

        if(i<cols){

            hArr.push(aBox[i].offsetHeight); 

        }else{

            var minH = Math.min.apply(null,hArr);

            var index = getMinIndex(hArr,minH);  //找出高最矮的 索引值

            //console.log(aBoxW);

            aBox[i].style.position = 'absolute';

            aBox[i].style.top = minH+'px';

            aBox[i].style.left = aBoxW*index+'px';

            hArr[index]+=aBox[i].offsetHeight;

        }

    }

}

//根据class获取到元素

function getBclass(parent,className){

    var boxarr = new Array(); //用来存储获取到的class

        //console.log(parent.prototype);

    allElement=parent.getElementsByTagName('*');

    for(var i=0;i<allElement.length;i++){

        if(allElement[i].className == className){

            boxarr.push(allElement[i]);

        }

    }

    return boxarr;

}

 

//找出高最矮的 索引值

function getMinIndex(arr,value){

    for(var i in arr){

        if (arr[i]==value){

            return i;

        }

    }

}

//建立一个检测轮轮滑动是否成立的函数  返回真假

function checkScroll(){

    var oparent = document.getElementById("content");

    var oBox = getBclass(oparent,'box');

    var lastoBoxTop = oBox[oBox.length-1].offsetTop+Math.floor(oBox[oBox.length-1].offsetHeight/2);

    //console.log(lastoBoxTop);

    var scrollTop = document.body.scrollTop||document.documentElement.scrollTop;

    var height = document.body.clientHeight||document.documentElement.clientHeight;

    //console.log(scrollTop);

    return(lastoBoxTop<scrollTop+height)?true:false;

}

css文件贴出来



*{margin: 0;padding: 0;}

body{background-color: #eee;}

.content{ 

    position: relative;

    }

.box{

    padding: 15px 0 0 15px;

    float: left;

}

.pic{

    padding: 10px;

    border: 1px solid #ccc;

    box-shadow: 0 0 5px #CCCCCC;

    border-radius: 5px;

    background: #fff;

}

.pic img{

    width: 220px;

    height: auto;

    border: 1px solid #eee;

}

html文件贴出来



<!DOCTYPE html>

<html>

    <head>

        <meta charset="utf-8" />

        <title>javascript瀑布流</title>

        <link rel="stylesheet" type="text/css" href="css/pubuli.css"/>

        <script type="text/javascript" src="js/my.js" ></script>

    </head>

    <body>

        <div id="content">

            <div class="box">

                <div class="pic">

                <img src="img/01.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/02.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/03.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/04.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/05.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/06.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/07.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/08.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/09.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/10.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/11.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/12.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/13.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/14.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/15.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/16.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/17.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/18.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/19.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/20.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/21.jpg"/> 

                </div>

            </div>

            <div class="box">

                <div class="pic">

                <img src="img/22.jpg"/> 

                </div>

            </div>

        </div>

         

    </body>

</html>

好了谢谢大家观看,以前没写过技术分享类文章,有很多不周到的地方希望大家能多多指正。学习前端的小菜鸟敬上Y(^_^)Y



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