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騰訊干貨！超實(shí)用的高清圖標(biāo)SVG解決方案全總結(jié)（下）
時(shí)間：2019-04-24 10:01:31
文章發(fā)布：李陽
原創(chuàng)作者：未知
來源：互聯(lián)網(wǎng)

騰訊干貨！超實(shí)用的高清圖標(biāo)SVG解決方案全總結(jié)（下）-藝源科技

在上一篇文章中，我們講述了字體渲染機(jī)制和導(dǎo)致iconfont出現(xiàn)鋸齒的原因，以及如何才能出繪制高質(zhì)量SVG ICON，并且提供了一套AI模版供大家參考使用。下文將講訴前端側(cè)我們?nèi)绾斡肧VG來做成高清IOCN，并且良好支持PC下的各個(gè)瀏覽器，并兼容IE6+以上的瀏覽器。

從上一篇文章中我們得知SVG 做的圖標(biāo)在IE9+的瀏覽器渲染效果相當(dāng)?shù)牟?，所以在IE下我們我們不使用SVG ICON，我們可以將SVG轉(zhuǎn)成一倍的png圖片來進(jìn)行替代。首先來簡單的普及一下SVG ICON的幾個(gè)使用方法：


第一種Inline SVG

這種方法就是直接把SVG標(biāo)簽寫入到HTML中去，直接通過修改fill和stroke屬性來控制填充顏色和邊框顏色，但是缺點(diǎn)就是維護(hù)性不好，如果一個(gè)頁面Icon特別多，可能要寫好幾十個(gè)SVG在頁面，復(fù)用性差，后期擴(kuò)展性也不佳。

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<svg  width="74" height="74" viewBox="0 0 74 74">
<path fill="#444444" d="M25.42 27.737v-11.555c0-6.382 5.174-11.555 11.555-11.555s11.555 
5.174 11.555 11.555v11.555h4.622v-11.555c0-8.935-7.243-16.178-16.178-16.178s-16.178 7.243-16.178 
16.178v11.555h4.622z"></path>
</svg>


第二種img/object 標(biāo)簽

這種方法直接將SVG ICON保存成一個(gè)一個(gè)單獨(dú)文件，通過img或object標(biāo)簽引用，他的缺點(diǎn)就是請求數(shù)增加，每個(gè)圖標(biāo)都去獨(dú)自加載，對服務(wù)器負(fù)載和頁面高速加載不好。

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<img src="svg/16-16.svg" alt="test icon" />


第三種background and Data URIs

在上一篇文章中我有一種調(diào)用方法就是采用background去調(diào)用SVG文件：

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.icon {  
backgound-image: url(test.svg)
}

還有如果單獨(dú)使用background引用SVG也會和第一種方案一樣造成請求數(shù)增加，所以有不少人通過使用base64 編碼來減少HTTP請求：

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.icon{   
background: url(data:text/svg+xml;base64,)
}

不過不太建議使用base64 編碼，無論性能和維護(hù)方面都不是特別好，記得看過一個(gè)測試base64性能的文章，base64在移動(dòng)端渲染時(shí)間比正常使用url的渲染時(shí)間要慢6倍。


第四種SVG Sprites

目前市面上有很多提供ICON FONT制作的網(wǎng)站，例如：icomoon不止開源，而且功能實(shí)在強(qiáng)大，可以提供輸出SVG Sprites的功能，SVG Sprites它的使用方法其實(shí)就跟Png sprites是一樣的，把多個(gè)SVG ICON合并到一個(gè)SVG文件里面去，然后通過background-position進(jìn)行定位，這種方法可以解決請求數(shù)增多的問題。

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.icon {
    width: 16px;    
    height: 16px;    
    display: inline-block;    
    background-repeat: no-repeat;    
    background-image: url(sprite.svg);     
    background-position: 0 0;
    }

當(dāng)然如果你不喜歡用icomoon也可以用自動(dòng)化工具生成SVG Sprite例如用：gulp-svgstore、grunt-iconizr、gulp-svg-sprites


第五種SVG Defs/Symbols

這種其實(shí)就是在SVG Sprites上面更進(jìn)一步的使用了，SVG Sprites是需要我們?nèi)ネㄟ^坐標(biāo)獲取對應(yīng)位置圖標(biāo)的，但是SVG Defs/Symbols就更簡單了，直接通過給每個(gè)SVG ICON定義ID，直接調(diào)用對應(yīng)ID即可：

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<svg xmlns="http://www.w3.org/2000/svg">    
<symbol id="icon1" viewBox="0 0 32 32">        
<path fill="#444444" d="M3 3h1v12h-1v-12z"></path>    
</symbol>    
<symbol id="icon2" viewBox="0 0 32 32">        
<path fill="#444444" d="M3 14h10v1h-10v-1z"></path>    
</symbol>
</svg>

將上面代碼保存為SVG文件后，在HTML我們通過下面的方式可以直接調(diào)用：

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<svg>    
<use xlink:href="/svg/symbol.svg#icon1"></use>
</svg>
<svg>    
<use xlink:href="/svg/symbol.svg#icon2"></use>
</svg>


新的方案：Svg Sprites +Png Sprites + Image-set

由于我們知道SVG在IE下的兼容性并不好，所以在高清ICON的適配在第四種方案的基礎(chǔ)上進(jìn)行優(yōu)化，首先用icomoon進(jìn)行下面的步驟操作：

第一步將用AI模板做好的圖標(biāo)轉(zhuǎn)換成SVG文件后導(dǎo)入到icomoon中：

騰訊干貨！超實(shí)用的高清圖標(biāo)SVG解決方案全總結(jié)（下）-藝源科技

第二步：

騰訊干貨！超實(shí)用的高清圖標(biāo)SVG解決方案全總結(jié)（下）-藝源科技

第三步，設(shè)置導(dǎo)出文件前的類名，圖標(biāo)間距，顏色等等一系列參數(shù)，然后下載壓縮包：

騰訊干貨！超實(shí)用的高清圖標(biāo)SVG解決方案全總結(jié)（下）-藝源科技

第四步，只獲取我們所需要的文件夾的內(nèi)容：

騰訊干貨！超實(shí)用的高清圖標(biāo)SVG解決方案全總結(jié)（下）-藝源科技

第五步，對icomoon生成的樣式sprite.css進(jìn)行微調(diào)整讓其適配所有PC瀏覽器和Retina下的瀏覽器：

騰訊干貨！超實(shí)用的高清圖標(biāo)SVG解決方案全總結(jié)（下）-藝源科技

后面的效果：

騰訊干貨！超實(shí)用的高清圖標(biāo)SVG解決方案全總結(jié)（下）-藝源科技


CSS4 Image-set

這里應(yīng)該有人會覺得也可以使用Media Queries來進(jìn)行判斷處理在Retinal來加載SVG Sprites，但其實(shí)Image-set它和Media Queries有些許，它不需要告訴瀏覽器使用什么圖像，而是直接提供了圖像讓瀏覽器自己去選擇加載合適的圖片。兼容性方面在Safari6.1開始和Chrome21就開始支持這個(gè)屬性了。


總結(jié)

SVG目前還是存在許多問題，Windows下使用IE的兼容性和渲染效果都太差，在PC側(cè)我們無法全量使用，所以我們可以用上面的這套解決方案解決PC下所有瀏覽器下兼容問題，在Retina下，不管是device =2還是3都可以兼容，不管未來是否會有更高的devicePixelRatio出來，按照上面的方法都能完美兼容，并且在對應(yīng)不同的devicePixelRatio下瀏覽器會自動(dòng)選擇加載SVG或者PNG，不會兩張都同時(shí)加載。

上一篇文章之所以在火狐圖標(biāo)出問題那塊講了許久，并拋出更嚴(yán)謹(jǐn)?shù)膱D標(biāo)制作方法的主要原因這個(gè)方案需要對合并后的SVG Sprites轉(zhuǎn)成PNG Sprite圖片，如果SVG ICON做的有問題，那生成的圖片也然出現(xiàn)發(fā)虛的情況，大家看我那個(gè)效果圖下，PC下所有瀏覽下，中間那個(gè)鎖的圖標(biāo)雖然是用的生成的圖片但是依舊是發(fā)虛的和火狐下當(dāng)時(shí)出問題的效果是一樣。

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