HTML5 图片预加载的示例代码在HTML里加载摄像头的方法基于HTML代码实现图片碎片化加载功能html5用video标签流式加载的实现传统HTML页面实现模块化加载的方法HTML页面缩小后显示滚动条的示例代码h5页面背景图很长要有滚动条滑动效果的实现HTML5实现直播间评论滚动效果的代码html+css实现滚动到元素位置显示加载动画效果

 var canvas = document.getElementById("canvas"); var context = canvas.getContext("2d"); var image = new Image(); image.src = "images/01.jpg"; context.drawImage(image, 0, 0); 

 var image = new Image(); image.src = "images/01.jpg"; image.onload = function() { context.drawImage(image, 0, 0); } 

 var image = document.getElementById('image'); 

 document.addEventListener("DOMContentLoaded", loadImages, true); var images = new Array(3), imageNums = 0; function loadImages() { for (var i = 0; i < images.length; i++) { images[i] = new Image(); images[i].addEventListener("load", trackProcess, true); images[i].src = "images/01.jpg"; } } function trackProcess() { imageNums++; if (imageNums = images.length) { drawImages(); } } function drawImages() { var canvas = document.getElementById("canvas"); var context = canvas.getContext("2d"); for (var i = 0; i < images.length; i++) { context.drawImage(images[i], 200 * i, 0); } }