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：
>
<html>
<head>
<meta charset="utf-8" />
<title>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>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。
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。
我在js里是这样调用init的：
init(50,"mylegend",800,400,main);
开始移动
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：
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;
}
}当我初始化完毕后，我加入了层，也就LSprite，用法如下：
■作用：
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。
■可用属性：
type:类型
x:坐标x
y:坐标y
scaleX:X坐标方向上的缩放比例
alpha:透明度
rotate:旋转角度
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
childList:该对象的所有子项
graphics:指定属于此 LSprite 的 Graphics 对象，在此 LSprite 中可执行矢量绘图命令。
box2dBody:结合box2dweb后，创建的body2d
mask:遮罩
举个例子：
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);
}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。
//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");
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：
drawRect(
thickness,
lineColor,
pointArray,
isfill,
color
)■作用：
画一个矩形
■参数：
thickness：边缘线粗
lineColor：边缘线颜色
pointArray：[起始坐标x,起始坐标y,矩形宽width,矩形高height]
isfill：是否实心图形
color：实心颜色
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：
if(speed <= -20){
<span style="white-space:pre"> </span>speed = 20;
}也就是说如果减少的速度达到了-20那就让矩形往回跑。
这样一来，来回滑动就做好了。
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）！
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