web前端|js教程
javascript,步骤,动画
web前端-js教程
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(function () { var COUNT = 300; var masthead = document.querySelector(.masthead); var canvas = document.createElement(canvas); var ctx = canvas.getContext(2d); var width = masthead.clientWidth; var height = masthead.clientHeight; var i = 0; var active = false; function onResize() {width = masthead.clientWidth;height = masthead.clientHeight;canvas.width = width;canvas.height = height;ctx.fillStyle = #FFF;var wasActive = active;active = width > 600;if (!wasActive && active) requestAnimFrame(update); } var Snowflake = function () {this.x = 0;this.y = 0;this.vy = 0;this.vx = 0;this.r = 0;this.reset(); }; Snowflake.prototype.reset = function() {this.x = Math.random() * width;this.y = Math.random() * -height;this.vy = 1 + Math.random() * 3;this.vx = 0.5 - Math.random();this.r = 1 + Math.random() * 2;this.o = 0.5 + Math.random() * 0.5; }; canvas.style.position = absolute; canvas.style.left = canvas.style.top = ; var snowflakes = [], snowflake; for (i = 0; i < COUNT; i++) {snowflake = new Snowflake();snowflakes.push(snowflake); } function update() {ctx.clearRect(0, 0, width, height);if (!active) return;for (i = 0; i height) {snowflake.reset(); }}requestAnimFrame(update); } // shim layer with setTimeout fallback window.requestAnimFrame = (function(){return window.requestAnimationFrame ||window.webkitRequestAnimationFrame ||window.mozRequestAnimationFrame ||function( callback ){ window.setTimeout(callback, 1000 / 60);}; })(); onResize(); window.addEventListener( esize, onResize, false); masthead.appendChild(canvas); })();
使用本站HTML/CSS/JS在线运行测试工具：/code/HtmlJsRun，可得到如下测试运行效果：
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