HTML5+Canvas的星星流星夜空背景动画特效

var WINDOW_WIDTH = document.body.offsetWidth;
var WINDOW_HEIGHT = document.body.offsetHeight;
var canvas,context;
var num = 500;
var stars = [];
var mouseX = WINDOW_WIDTH/2;
var mouseY = WINDOW_HEIGHT/2;
var rnd;

window.onload = function(){
canvas = document.getElementById('canvas');
canvas.width = WINDOW_WIDTH;
canvas.height = WINDOW_HEIGHT;

context = canvas.getContext('2d');

addStar();
setInterval(render,33);
liuxing();

// render();
document.body.addEventListener('mousemove',mouseMove);
}

这是一款基于HTML5 Canvas实现的非常逼真的满天繁星动画特效，漆黑的夜空中，星星和流星背景动画特效。

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