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index.html
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<!DOCTYPE html>
<html>
<!-- title -->
<head><meta name="generator" content="Hexo 3.9.0">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
<meta name="author" content="汪秋月">
<meta name="renderer" content="webkit">
<meta name="copyright" content="汪秋月">
<meta name="keywords" content="渣博客 | 汪秋月">
<meta name="description" content="汪秋月的个人博客">
<meta name="Cache-Control" content="no-cache">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>分享专用</title>
<style type="text/css">
@font-face {
font-family: 'Oswald-Regular';
src: url("/font/Oswald-Regular.ttf");
}
body {
margin: 0;
}
header,
footer,
.back-top,
.sidebar,
.container,
.site-intro-meta,
.toc-wrapper {
display: none;
}
.site-intro {
position: relative;
z-index: 3;
width: 100%;
/* height: 50vh; */
overflow: hidden;
}
.site-intro-placeholder {
position: absolute;
z-index: -2;
top: 0;
left: 0;
width: calc(100% + 300px);
height: 100%;
background: repeating-linear-gradient(-45deg, #444 0, #444 80px, #333 80px, #333 160px);
background-position: center center;
transform: translate3d(-226px, 0, 0);
animation: gradient-move 2.5s ease-out 0s 1;
}
@keyframes gradient-move {
0% {
transform: translate3d(-226px, 0, 0);
}
100% {
transform: translate3d(0, 0, 0);
}
}
</style>
<link rel="preload" href="/css/style.css?v=20180501" as="style" onload="this.onload=null;this.rel='stylesheet'">
<link rel="stylesheet" href="/css/mobile.css?v=20180501" media="(max-width: 980px)">
<!-- /*! loadCSS. [c]2017 Filament Group, Inc. MIT License */
/* This file is meant as a standalone workflow for
- testing support for link[rel=preload]
- enabling async CSS loading in browsers that do not support rel=preload
- applying rel preload css once loaded, whether supported or not.
*/ -->
<script>
(function( w ){
"use strict";
// rel=preload support test
if( !w.loadCSS ){
w.loadCSS = function(){};
}
// define on the loadCSS obj
var rp = loadCSS.relpreload = {};
// rel=preload feature support test
// runs once and returns a function for compat purposes
rp.support = (function(){
var ret;
try {
ret = w.document.createElement( "link" ).relList.supports( "preload" );
} catch (e) {
ret = false;
}
return function(){
return ret;
};
})();
// if preload isn't supported, get an asynchronous load by using a non-matching media attribute
// then change that media back to its intended value on load
rp.bindMediaToggle = function( link ){
// remember existing media attr for ultimate state, or default to 'all'
var finalMedia = link.media || "all";
function enableStylesheet(){
link.media = finalMedia;
}
// bind load handlers to enable media
if( link.addEventListener ){
link.addEventListener( "load", enableStylesheet );
} else if( link.attachEvent ){
link.attachEvent( "onload", enableStylesheet );
}
// Set rel and non-applicable media type to start an async request
// note: timeout allows this to happen async to let rendering continue in IE
setTimeout(function(){
link.rel = "stylesheet";
link.media = "only x";
});
// also enable media after 3 seconds,
// which will catch very old browsers (android 2.x, old firefox) that don't support onload on link
setTimeout( enableStylesheet, 3000 );
};
// loop through link elements in DOM
rp.poly = function(){
// double check this to prevent external calls from running
if( rp.support() ){
return;
}
var links = w.document.getElementsByTagName( "link" );
for( var i = 0; i < links.length; i++ ){
var link = links[ i ];
// qualify links to those with rel=preload and as=style attrs
if( link.rel === "preload" && link.getAttribute( "as" ) === "style" && !link.getAttribute( "data-loadcss" ) ){
// prevent rerunning on link
link.setAttribute( "data-loadcss", true );
// bind listeners to toggle media back
rp.bindMediaToggle( link );
}
}
};
// if unsupported, run the polyfill
if( !rp.support() ){
// run once at least
rp.poly();
// rerun poly on an interval until onload
var run = w.setInterval( rp.poly, 500 );
if( w.addEventListener ){
w.addEventListener( "load", function(){
rp.poly();
w.clearInterval( run );
} );
} else if( w.attachEvent ){
w.attachEvent( "onload", function(){
rp.poly();
w.clearInterval( run );
} );
}
}
// commonjs
if( typeof exports !== "undefined" ){
exports.loadCSS = loadCSS;
}
else {
w.loadCSS = loadCSS;
}
}( typeof global !== "undefined" ? global : this ) );
</script>
<link rel="icon" href="/assets/favicon.ico">
<link rel="preload" href="https://cdn.jsdelivr.net/npm/[email protected]/webfontloader.min.js" as="script">
<link rel="preload" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/jquery.min.js" as="script">
<link rel="preload" href="/scripts/main.js" as="script">
<link rel="preload" as="font" href="/font/Oswald-Regular.ttf" crossorigin>
<link rel="preload" as="font" href="https://at.alicdn.com/t/font_327081_1dta1rlogw17zaor.woff" crossorigin>
<!-- 百度统计 -->
<!-- 谷歌统计 -->
</head>
<body class="home-body">
<header class="header index-header">
<div class="read-progress"></div>
<div class="header-sidebar-menu"></div>
<!-- post页的toggle banner -->
<a class="home-link" href=/>技术分享专用</a>
</header>
<div class="wrapper">
<div class="site-intro" style=
height:50vh;
>
<!-- 主页 -->
<!-- 文章页 -->
<div class="site-intro-placeholder"></div>
<div class="site-intro-img" style="background-image: url(/intro/index-bg.jpg)"></div>
<div class="site-intro-meta">
<!-- 标题 -->
<h1 class="intro-title">
<!-- 主页 -->
技术分享专用
<!-- 文章页 -->
</h1>
<!-- 副标题 -->
<p class="intro-subtitle">
<!-- 主页副标题 -->
这个人很懒，什么都没有
<!-- 文章页 -->
</p>
<!-- 文章页meta -->
</div>
</div>
<script>
// load webfont-loader async, and add callback function
function async(u, cb, err) {
var d = document, t = 'script',
o = d.createElement(t),
s = d.getElementsByTagName(t)[0];
o.src = u;
if (cb) { o.addEventListener('load', function (e) { cb(null, e); }, false); }
if (err) { o.addEventListener('error', function (e) { err(null, e); }, false); }
s.parentNode.insertBefore(o, s);
}
// get user agent
var browser = {
versions: function () {
var u = window.navigator.userAgent;
return {
userAgent: u,
trident: u.indexOf('Trident') > -1, //IE内核
presto: u.indexOf('Presto') > -1, //opera内核
webKit: u.indexOf('AppleWebKit') > -1, //苹果、谷歌内核
gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐内核
mobile: !!u.match(/AppleWebKit.*Mobile.*/), //是否为移动终端
ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端
android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android终端或者uc浏览器
iPhone: u.indexOf('iPhone') > -1 || u.indexOf('Mac') > -1, //是否为iPhone或者安卓QQ浏览器
iPad: u.indexOf('iPad') > -1, //是否为iPad
webApp: u.indexOf('Safari') == -1, //是否为web应用程序，没有头部与底部
weixin: u.indexOf('MicroMessenger') == -1, //是否为微信浏览器
uc: u.indexOf('UCBrowser') > -1 //是否为android下的UC浏览器
};
}()
}
console.log("userAgent:" + browser.versions.userAgent);
// callback
function fontLoaded() {
console.log('font loaded');
if (document.getElementsByClassName('site-intro-meta')) {
document.getElementsByClassName('intro-title')[0].classList.add('intro-fade-in');
document.getElementsByClassName('intro-subtitle')[0].classList.add('intro-fade-in');
var postIntroTags = document.getElementsByClassName('post-intro-tags')[0],
postIntroMeat = document.getElementsByClassName('post-intro-meta')[0];
if (postIntroTags) {
postIntroTags.classList.add('post-fade-in');
}
if (postIntroMeat) {
postIntroMeat.classList.add('post-fade-in');
}
}
}
// UC不支持跨域，所以直接显示
function asyncCb(){
if (browser.versions.uc) {
console.log("UCBrowser");
fontLoaded();
} else {
WebFont.load({
custom: {
families: ['Oswald-Regular']
},
loading: function () { //所有字体开始加载
// console.log('loading');
},
active: function () { //所有字体已渲染
fontLoaded();
},
inactive: function () { //字体预加载失败，无效字体或浏览器不支持加载
console.log('inactive: timeout');
fontLoaded();
},
timeout: 5000 // Set the timeout to two seconds
});
}
}
function asyncErr(){
console.warn('script load from CDN failed, will load local script')
}
var asyncLoadWithFallBack = function(arr, success, reject) {
var currReject = function(){
reject()
arr.shift()
if(arr.length)
async(arr[0], success, currReject)
}
async(arr[0], success, currReject)
}
asyncLoadWithFallBack([
"https://cdn.jsdelivr.net/npm/[email protected]/webfontloader.min.js",
"https://cdn.bootcss.com/webfont/1.6.28/webfontloader.js",
"/lib/webfontloader.min.js"
], asyncCb, asyncErr)
</script>
<img class="loading" src="/assets/loading.svg" style="display: block; margin: 6rem auto 0 auto; width: 6rem; height: 6rem;" />
<div class="container container-unloaded">
<main class="main index-page">
<article class="index-post">
<a class="abstract-title" href = "/2021/02/05/canvas/" >
<span>初识canvas与canvas动画实现原理</span>
</a>
<div class="abstract-content">
参考：canvas API中文文档
初识canvas与canvas动画实现原理什么是 canvas
canvas 是一个HTML5标签
canvas 的作用是绘制图形
canvas 本身并没有绘图能力，通常是通过js绘制
canvas 提供了多种绘制路径、矩形、圆形、字符以及添加图像等方法可以供开发者调用，可以完成工作中遇到的绝大部分开发问题
canvas 的主要作用
特效、动图
制作图形编辑器等工具
用于可视化领域
可内嵌多种媒体内容和特效内容
游戏，适合图像密集，其中的许多对象会被频繁重绘的游戏
canvas 和 svg 的简单对比
canvas 是HTML5标签，svg 是XM...
</div>
<div class="abstract-post-meta">
<!-- date -->
<div class="abstract-date">
<span class="abstract-calander iconfont-archer"></span><span class="abstract-time">2021/02/05</span>
</div>
<!-- tags -->
<div class= abstract-tags >
<a class="post-tag" href="javascript:void(0);" data-tags = "canvas">canvas</a>
</div>
</div>
</article>
<!-- paginator -->
</main>
<!-- profile -->
<div class="profile">
<img class="profile-avatar" src= /avatar/sb.jpg >
<div class="profile-name">zoe.wang</div>
<div class="profile-signature">
不要联系我
</div>
<div class="profile-social">
<a href="mailto:[email protected]" class="iconfont-archer email" title=email ></a>
<span class="iconfont-archer wechat" title=wechat>
<img class="profile-qr" src="/assets/wx.png" />
</span>
</div>
<div class="friends">
<div>FRIENDS</div>
<span>
<a href= //www.baidu.com target="_black">百度</a>
</span>
<span>
<a href= //www.google.com target="_black">谷歌</a>
</span>
</div>
</div>
</div>
<footer class="footer footer-unloaded">
<!-- social -->
<div class="social">
<a href="mailto:[email protected]" class="iconfont-archer email" title=email ></a>
<span class="iconfont-archer wechat" title=wechat>
<img class="profile-qr" src="/assets/wx.png" />
</span>
</div>
<!-- powered by Hexo -->
<div class="copyright">
<span id="hexo-power">Powered by <a href="https://hexo.io/" target="_blank">Hexo</a></span><span class="iconfont-archer power"></span><span id="theme-info">theme <a href="https://github.com/fi3ework/hexo-theme-archer" target="_blank">Archer</a></span>
</div>
<!-- 不蒜子 -->
<div class="busuanzi-container">
<span id="busuanzi_container_site_pv">PV: <span id="busuanzi_value_site_pv">豆腐脑小明</span>
</span>
</div>
</footer>
</div>
<!-- toc -->
<div class="back-top iconfont-archer"></div>
<div class="sidebar sidebar-hide">
<ul class="sidebar-tabs sidebar-tabs-active-0">
<li class="sidebar-tab-archives"><span class="iconfont-archer"></span><span class="tab-name">Archive</span></li>
<li class="sidebar-tab-tags"><span class="iconfont-archer"></span><span class="tab-name">Tag</span></li>
<li class="sidebar-tab-categories"><span class="iconfont-archer"></span><span class="tab-name">Cate</span></li>
</ul>
<div class="sidebar-content sidebar-content-show-archive">
<div class="sidebar-panel-archives">
<!-- 在ejs中将archive按照时间排序 -->
<div class="total-archive"> Total : 1 </div>
<div class="post-archive">
<div class="archive-year"> 2021 </div>
<ul class="year-list">
<li class="archive-post-item">
<span class="archive-post-date">02/05</span><a class="archive-post-title" href= "/2021/02/05/canvas/" >初识canvas与canvas动画实现原理</a>
</li>
</div>
</div>
<div class="sidebar-panel-tags">
<div class="sidebar-tags-name">
<span class="sidebar-tag-name" data-tags="canvas"><span class="iconfont-archer"></span>canvas</span>
</div>
<div class="iconfont-archer sidebar-tags-empty"></div>
<div class="tag-load-fail" style="display: none; color: #ccc; font-size: 0.6rem;">
缺失模块。<br/>
1、请确保node版本大于6.2<br/>
2、在博客根目录（注意不是archer根目录）执行以下命令：<br/>
<span style="color: #f75357; font-size: 1rem; line-height: 2rem;">npm i hexo-generator-json-content --save</span><br/>
3、在根目录_config.yml里添加配置：
<pre style="color: #787878; font-size: 0.6rem;">
jsonContent:
meta: false
pages: false
posts:
title: true
date: true
path: true
text: false
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: true
tags: true</pre>
</div>
<div class="sidebar-tags-list"></div>
</div>
<div class="sidebar-panel-categories">
<div class="sidebar-categories-name">
</div>
<div class="iconfont-archer sidebar-categories-empty"></div>
<div class="sidebar-categories-list"></div>
</div>
</div>
</div>
<script>
var siteMeta = {
root: '/',
author: '汪秋月'
}
</script>
<!-- CDN failover -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/jquery.min.js"></script>
<script type="text/javascript">
if (typeof window.$ === 'undefined')
{
console.warn('jquery load from jsdelivr failed, will load local script')
document.write('<script src="/lib/jquery.min.js">\x3C/script>')
}
</script>
<script src="/scripts/main.js"></script>
<!-- busuanzi -->
<!--
<script async src="//dn-lbstatics.qbox.me/busuanzi/2.3/busuanzi.pure.mini.js"></script>
-->
<!-- CNZZ -->
<!--
</div> -->
<!-- async load share.js -->
<!-- -->
</body>
</html>