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HTML5制作仿jQuery效果

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发布时间:2016-05-17 09:08:33

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来源于php中文网

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开言

       本篇文章通过开源html5引擎lufylegend实现JQuery滑动效果。能使一个矩形来回减速加速滑行。由于用到了html5里的canvas,所以如果大家要测试程序,请用支持html5的浏览器打开。源码下载稍后提供。

初始化页面

首先我们来看看html文件里的代码:

>  
  
  
      
    html5 game - 仿jquerytitle>  
    <script type="text/javascript" src="./js/lufylegend-1.6.1.min.js">script>  
    <script type="text/javascript" src="./js/main.js">script>  
head>  
<body>  
    <div id="mylegend">loading……div>  
body>  
html></pre><p>   也许有人疑问,说是用html5,怎么不见canvas标签???其实当你使用lufylegend开发时,根本不需要加入canvas标签。只需要调用该引擎中的init函数并向参数赋值就能自动将canvas标签加到html文件中。</p>
<p><span>立即学习</span>“<a href="https://pan.quark.cn/s/cb6835dc7db1" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">前端免费学习笔记(深入)</a>”;</p>
<p>        接下来让我们看看init用法:init(speed,id,width,height,function,type);其中speed代表页面更换速度,id代表传入的一个div的id,库件进行初始化的时候,会自动将canvas加入到此div内部,width和height分别代表页面大小,function就是初始化完成后调用的函数,最后一个参数type为null时,会先进行页面的onload操作,如果init函数调用是在onload之后,那么需要将此参数设为LEvent.INIT。</p>
<p>我在js里是这样调用init的:</p><pre class="brush:php;toolbar:false">init(50,"mylegend",800,400,main);</pre><p style="word-wrap: break-word; margin: 0px; padding: 0px; font-size: 1em; color: rgb(0, 0, 0); white-space: normal; font-family: Arial; line-height: 26px; background-color: rgb(255, 255, 255);">开始移动</p>
<p>看完初始化部分,我们不仿来看看是怎样做到能使一个矩形来回减速加速滑行。首先我们来看看main.js里的代码:</p><pre class="brush:js;toolbar:false">init(50,"mylegend",800,400,main);  
var backLayer;  
var speed = 20,x = 0;  
function main(){  
    //加入层  
    initLayer();  
    //开始移动  
    setInterval(function(){move();},10);  
}  
function initLayer(){  
    //加入背景层  
    backLayer = new LSprite();  
    addChild(backLayer);  
}  
function move(){  
    //清空背景  
    backLayer.graphics.drawRect(0,"white",[0,0,800,400],true,"white");  
    //绘制矩形  
    backLayer.graphics.drawRect(0,"dimgray",[x+=speed,0,200,200],true,"gray");  
    //将速度逐渐变小  
    speed--;  
    //当速度小于或等于-20时,将速度重新设为20  
    if(speed <= -20){  
        speed = 20;  
    }  
}</pre><p>当我初始化完毕后,我加入了层,也就LSprite,用法如下:</p>
<p>■作用:<br>LSprite 类是基本显示列表构造块,一个可显示图形并且也可包含子项的显示列表节点。<br><br></p>
<p>■可用属性:<br>type:类型<br>x:坐标x<br>y:坐标y<br>scaleX:X坐标方向上的缩放比例<br>alpha:透明度<br>rotate:旋转角度<br>visible:是否可见,当设为false的时候,该LBitmap对象不可视,且内部所有处理都将停止<br>childList:该对象的所有子项<br>graphics:指定属于此 LSprite 的 Graphics 对象,在此 LSprite 中可执行矢量绘图命令。<br>box2dBody:结合box2dweb后,创建的body2d<br>mask:遮罩</p><div class="aritcle_card flexRow">
							<div class="artcardd flexRow">
								<a class="aritcle_card_img" href="/xiazai/js/8035" title="jQuery仿苹果官网导航特效"><img
										src="https://img.php.cn/upload/jscode/000/000/018/170912520257544.jpg" alt="jQuery仿苹果官网导航特效"></a>
								<div class="aritcle_card_info flexColumn">
									<a href="/xiazai/js/8035" title="jQuery仿苹果官网导航特效">jQuery仿苹果官网导航特效</a>
									<p>jQuery仿苹果官网导航特效是一款黑色的苹果官网导航栏,带下拉搜索框提示效果。</p>
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<p>举个例子:</p><pre class="brush:js;toolbar:false">var loader;    
init(200,"mylegend",500,350,main);  
function main(){    
    loader = new LLoader();    
    loader.addEventListener(LEvent.COMPLETE,loadBitmapdata);    
    loader.load("img.png","bitmapData");    
}    
function loadBitmapdata(event){    
    var bitmapdata = new LBitmapData(loader.content,0,0,64,64);    
    var bitmap = new LBitmap(bitmapdata);  
    var layer = new LSprite();  
    addChild(layer);  
    layer.addChild(bitmap);  
}</pre><p>当层初始化完成后,就可以开始移动矩形了。首先我用setInterval不断地画矩形,为了不让矩形重叠,我让它每画一次,清空一次屏幕。</p><pre class="brush:js;toolbar:false">//清空背景  
backLayer.graphics.drawRect(0,"white",[0,0,800,400],true,"white");  
//绘制矩形  
backLayer.graphics.drawRect(0,"dimgray",[x+=speed,0,200,200],true,"gray");</pre><p>以上代码实现了不断画矩形。可以看到,我是在backLayer层上实行绘制的。至于graphics的用法,我将它列在下面:</p><pre class="brush:php;toolbar:false">drawRect( 
    thickness, 
    lineColor, 
    pointArray, 
    isfill, 
    color 
)</pre><p>■作用:<br>画一个矩形</p>
<p><br>■参数:<br>thickness:边缘线粗<br>lineColor:边缘线颜色<br>pointArray:[起始坐标x,起始坐标y,矩形宽width,矩形高height]<br>isfill:是否实心图形<br>color:实心颜色<br><br></p>
<p>接下来就是改变速度。首先我将每次移动的速度减少1,然后进行一次重新绘制。这样的画就可以进行减速加速滑行。速度减少成了负数就会往反方向走,但如果减少的太多就会移出屏幕,所以给它一个限制:</p><pre class="brush:php;toolbar:false">if(speed <= -20){  
<span style="white-space:pre">  </span>speed = 20;  
}</pre><p>也就是说如果减少的速度达到了-20那就让矩形往回跑。</p>
<p>这样一来,来回滑动就做好了。</p>
<p>以上就是HTML5制作仿jQuery效果的内容,更多相关内容请关注PHP中文网(www.php.cn)!</p>					</div>
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