上午慕课没改版前放了老湿的 共嗨世界杯 那个球掉粗来的效果，我上班手贱在看，结果组管在后面也看到了这个效果很是喜欢，让我也做一个一样的拿来用，可惜小白的我哪里写的粗来，于是我给偷了下来，可是我偷下来的却执行时提示我 找不到对象...找了半天也找不到对象，跪求好心人帮助~~~~(>_<)~~~~ 下面是老湿挂慕课首页的效果源码，和我在本地报错截图define(function(){
var requestAnimFrame = (function() {
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(callback) {
setTimeout(callback, 1000 / 60)
}
})();
var canvas
var context
var image
var ball
var supportCanvas = document.createElement('canvas').getContext
function Ball(ballimage, options) {
this.width = options.width
this.height = options.height
this.containerWidth = options.containerWidth
this.containerHeight = options.containerHeight
this.x = options.left
this.y = options.top
this.image = ballimage
this.gravity = 0.4
this.vy = 0.8
this.vx = 4
this.vyAdjust = -15
this.vxAdjust = 0.25
this.factor = 0.65
this.end = false
this.degree = 0
this.ctx = options.ctx
this.canvas = options.canvas
this.ball = ballimage.parentNode
}
Ball.prototype.draw = function() {
if (supportCanvas) {
this.ctx.save()
this.rotate()
this.ctx.drawImage(this.image,
0, 0,
100, 100,
this.x, this.y,
this.width, this.height
)
this.ctx.restore()
if (this.vx > 0) {
this.degree += 1 * this.vx
}
}
else {
this.ball.style.left = this.x + 'px'
this.ball.style.top = this.y + 'px'
}
}
Ball.prototype.hit = function() {
this.vy = this.vyAdjust
}
Ball.prototype.rotate = function() {
this.ctx.translate(this.x + this.width / 2, this.y + this.height / 2)
this.ctx.rotate(Math.PI / 180 * this.degree)
this.ctx.translate(-this.x - this.width / 2, -this.y - this.height / 2)
}
Ball.prototype.move = function() {
this.y += this.vy
this.vy += this.gravity
if (this.vx > 0) {
this.x += this.vx
}
if ((this.y + this.height) > this.containerHeight) {
this.hit()
this.vyAdjust = (this.vyAdjust * this.factor)
this.vx = this.vx - this.vxAdjust
}
if (this.vx < -0.1) {
this.end = true
}
}
Ball.prototype.clearCanvas = function() {
this.ctx && this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height)
}
Ball.prototype.update = function() {
this.clearCanvas()
this.move()
this.draw()
}
function loop() {
ball.update()
if (!ball.end) {
requestAnimFrame(loop)
}
if(ball.end){
var x=1000-ball.x-100,
//y=ball.y,
a=document.createElement("a"),
style;
a.id="football-holder";
style=a.style;
a.style.position="fixed";
a.style.right=x+"px";
a.style.bottom="0px";
a.style.zIndex="99999";
a.style.lineHeight="0";
a.href="/view/134";
a.innerHTML="<img src='http://www.shrose.cn/zq/images/football.png' width='100'/>";
var vendor="transform,webkitTransform,mozTransform,oTransform,msTransform".split(","),
i=vendor.length,
style=a.style;
while(i){
if(style[vendor[--i]]!==undefined){
style[vendor[i]]="rotate("+ball.degree+"deg)";
break;
}
}
document.body.replaceChild(a,canvas);
}
}
function loadBall() {
ball = new Ball(image, {
width: 100,
height: 100,
left: 0,
top: 0,
containerWidth: 1000,
containerHeight: 500,
ctx: context,
canvas: canvas
})
loop()
}
function init() {
var url="/view/134";
image = new Image()
image.src = 'http://www.shrose.cn/zq/images/football.png'
if (!supportCanvas) {
var ballContainer = document.getElementById('ball')
ballContainer.appendChild(image)
ballContainer.style.display = 'block'
}
else {
canvas = document.getElementById('football')
context = canvas.getContext('2d')
canvas.style.display = 'block'
}
image.onload = loadBall
}
var football = {
play: function() {
init()
}
}
return football
});
添加回答
举报
0/150
提交
取消