{"id":6920,"date":"2018-10-08T17:23:13","date_gmt":"2018-10-08T09:23:13","guid":{"rendered":"https:\/\/sdeno.com\/?p=6920"},"modified":"2018-11-23T14:25:50","modified_gmt":"2018-11-23T06:25:50","slug":"%e8%a7%a3%e5%86%b3%ef%bc%9awebp%e5%85%bc%e5%ae%b9%e6%80%a7%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/sdeno.com\/?p=6920","title":{"rendered":"\u89e3\u51b3\uff1awebp\u517c\u5bb9\u6027\u95ee\u9898"},"content":{"rendered":"
<\/div>
<\/div><\/div><\/div>\"https:\/\/sdeno.com\/wp-content\/uploads\/2018\/10\/webpx.jpg\"<\/figure>\n

webp\u662f\u8c37\u6b4c\u5f00\u53d1\u7684\u4e00\u4e2a\u56fe\u7247\u683c\u5f0f\uff0c\u8ddf\u666e\u901a\u7684jpg\u6bd4\u8d77\u6765\uff0c\u5982\u679c\u540c\u5927\u5c0f\u7684\u56fe\u7247\u60c5\u51b5\u4e0b\uff0cwebp\u4f1a\u6bd4\u8f83\u6e05\u6670\u3002<\/p>\n

\u706b\u72d0\u4e5f\u5f00\u59cb\u652f\u6301webp\u683c\u5f0f\uff0c\u6240\u4ee5\u4ee5\u540ewebp\u5c31\u662f\u524d\u7aef\u7684\u8d8b\u52bf\u3002\u4f46\u662fie\u6d4f\u89c8\u5668\u4e0d\u652f\u6301\uff0c\u8fd9\u91cc\u9700\u8981\u505a\u517c\u5bb9\u8003\u8651\u3002<\/p>\n

\u4e0b\u8f7d\uff1awebp<\/a><\/p>\n

 <\/p>\n

HTML:<\/p>\n

<script type=\"text\/javascript\" src=\"WebP.js\"><\/script>\r\n\r\n<img src=\"http:\/\/www.etherdream.com\/WebP\/Test.webp\" \/><\/pre>\n
 <\/p>\n
\u6848\u4f8b\u4ee5\u53ca\u6765\u6e90\uff1ahttp:\/\/www.etherdream.com\/WebP\/<\/a><\/p>\n
 <\/p>\n
\u5728\u7ebf\u8f6c\u6362webp\uff1ahttps:\/\/www.upyun.com\/webp<\/a><\/p>\n
 <\/p>\n
\u5176\u4ed6\u65b9\u6cd5\u517c\u5bb9\uff1a<\/p>\n
\u59ff\u52bf\u4e00\uff1a\u00a0<picture>\u6807\u7b7e<\/h4>\n
<picture>\u662fHTML5\u4e2d\u7684\u4e00\u4e2a\u65b0\u6807\u7b7e\uff0c\u7c7b\u4f3c<video>\u5b83\u4e5f\u53ef\u4ee5\u6307\u5b9a\u591a\u4e2a\u683c\u5f0f\u7684\u8d44\u6e90\uff0c\u7531\u6d4f\u89c8\u5668\u9009\u62e9\u81ea\u5df1\u652f\u6301\u7684\u683c\u5f0f\u8fdb\u884c\u52a0\u8f7d\u3002<\/p>\n
<picture class<\/span><\/span>=\"picture\"<\/span>>\r\n  <source<\/span> type<\/span>=\"image\/webp\"<\/span> srcset<\/span>=\"image.webp\"<\/span>><\/span>\r\n  <img<\/span> class<\/span>=\"image\"<\/span> src<\/span>=\"image.jpg\"<\/span>><\/span>\r\n<\/picture<\/span>><\/span>\r\n<\/span><\/code><\/pre>\n
\u5982\u679c\u6d4f\u89c8\u5668\u652f\u6301WebP\u683c\u5f0f\uff0c\u5c31\u4f1a\u52a0\u8f7dimage.webp\uff0c\u5426\u5219\u4f1a\u52a0\u8f7dimage.jpg\u3002<\/p>\n
\u5373\u4f7f\u6d4f\u89c8\u5668\u4e0d\u652f\u6301<picture>\u6807\u7b7e\uff0c\u56fe\u7247\u4ecd\u7136\u4f1a\u6b63\u5e38\u663e\u793a\uff0c\u53ea\u662fCSS\u53ef\u80fd\u65e0\u6cd5\u6b63\u786e\u9009\u53d6\u5230picture\u5143\u7d20\u3002\u6bd4\u5982\u5728IE8\u4e2d\uff0c\u4e0b\u9762\u7684CSS\u5c31\u4e0d\u4f1a\u8d77\u4f5c\u7528\uff1a<\/p>\n
.picture<\/span> img<\/span> {\r\n  width<\/span>: 100px<\/span>;\r\n  height<\/span>: 100px<\/span>;\r\n}\r\n<\/code><\/pre>\n
\u4f46\u662f\u53ef\u4ee5\u8fd9\u6837\u6765\u7ed9\u56fe\u7247\u5199\u6837\u5f0f\uff1a<\/p>\n
.image<\/span> {\r\n  width<\/span>: 100px<\/span>;\r\n  height<\/span>: 100px<\/span>;\r\n}\r\n<\/code><\/pre>\n
\u5373\u4f7f\u6d4f\u89c8\u5668\u4f7f\u7528\u7684\u662fWebP\u683c\u5f0f\u7684\u56fe\u7247\uff0c\u6700\u7ec8\u8fd8\u662f\u4f1a\u5e94\u7528img\u5143\u7d20\u7684\u6837\u5f0f\u3002<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u662f\u6700\u7b80\u5355\u7684\uff0c\u4f46\u662f\u4e0d\u80fd\u4f5c\u7528\u4e8eCSS\u4e2d\u7684\u56fe\u7247\uff08\u5982\u80cc\u666f\uff09\u3002<\/p>\n
 <\/p>\n
 <\/p>\n
\u59ff\u52bf\u4e8c\uff1a\u4f7f\u7528JS\u66ff\u6362\u56fe\u7247\u7684URL\u3002<\/h4>\n
\u6211\u4eec\u6709\u5f88\u591a\u7684\u9875\u9762\u5f80\u5f80\u4f1a\u7528\u5230\u56fe\u7247\u7684\u201c\u61d2\u52a0\u8f7d\u201d\u2014\u2014\u901a\u5e38\u662f\u628a\u56fe\u7247\u7684URL\u653e\u5728img\u5143\u7d20\u7684\u4e00\u4e2a\u81ea\u5b9a\u4e49\u5c5e\u6027\u4e2d\uff0c\u7136\u540e\u7528JS\u5728\u9002\u5f53\u7684\u65f6\u673a\u5c06URL\u8d4b\u503c\u7ed9src\u5c5e\u6027\u3002\u7528\u7c7b\u4f3c\u7684\u539f\u7406\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u6d4f\u89c8\u5668\u662f\u5426\u652f\u6301WebP\u683c\u5f0f\uff0c\u7ed9img\u5143\u7d20\u8d4b\u4e88\u4e0d\u540c\u7684src\u503c\u3002<\/p>\n
\u9996\u5148\u6211\u4eec\u9700\u8981\u7528JS\u6765\u5224\u65ad\u6d4f\u89c8\u5668\u662f\u5426\u652f\u6301WebP\u683c\u5f0f\uff0c\u65b9\u6cd5\u662f\u7ed9\u6d4f\u89c8\u5668\u4e00\u4e2aWebP\u683c\u5f0f\u7684\u56fe\u7247\uff0c\u770b\u6d4f\u89c8\u5668\u80fd\u5426\u6b63\u786e\u6e32\u67d3\u3002\u8fd9\u79cd\u65b9\u6cd5\u662f\u5f02\u6b65\u7684\uff0c\u6240\u4ee5\u9700\u8981\u628a\u540e\u7eed\u7684\u64cd\u4f5c\u5199\u5728\u56de\u8c03\u51fd\u6570\u4e2d\u3002\u6211\u4eec\u53ef\u4ee5\u5c06\u7ed3\u679c\u5b58\u50a8\u5728localStorage\u4e2d\uff0c\u8fd9\u6837\u4e4b\u540e\u5c31\u4e0d\u7528\u518d\u6b21\u68c0\u67e5\u4e86\u3002<\/p>\n
function<\/span> checkWebp<\/span>(callback)<\/span> <\/span>{\r\n  var<\/span> img = new<\/span> Image();\r\n  img.onload = function<\/span> ()<\/span> <\/span>{\r\n    var<\/span> result = (img.width > 0<\/span>) && (img.height > 0<\/span>);\r\n    callback(result);\r\n  };\r\n  img.onerror = function<\/span> ()<\/span> <\/span>{\r\n    callback(false<\/span>);\r\n  };\r\n  img.src = 'data:image\/webp;base64,UklGRiIAAABXRUJQVlA4IBYAAAAwAQCdASoBAAEADsD+JaQAA3AAAAAA'<\/span>;\r\n}<\/code><\/pre>\n
\u7136\u540e\u7528\u4e0b\u9762\u7684\u4ee3\u7801\u6765\u6839\u636e\u662f\u5426\u652f\u6301WebP\u66ff\u6362\u76f8\u5e94\u7684src\u3002<\/p>\n
function<\/span> showImage<\/span>(useWebp<\/span>)<\/span>{\r\n  var<\/span> imgs = Array<\/span>.from(document<\/span>.querySelectorAll('img'<\/span>));\r\n\r\n  imgs.forEach(function<\/span>(i<\/span>)<\/span>{\r\n    var<\/span> src = i.attributes['data-src'<\/span>].value;\r\n\r\n    if<\/span> (useWebp){\r\n      src = src.replace(\/\\.jpg$\/<\/span>, '.webp'<\/span>);\r\n    }\r\n\r\n    i.src = src;\r\n  });\r\n}\r\n\r\ncheckWebp(showImage);<\/code><\/pre>\n
\u8fd9\u79cd\u65b9\u5f0f\u7684\u4f18\u70b9\u662f\u53ef\u4ee5\u4e0e\u5df2\u6709\u7684\u61d2\u52a0\u8f7d\u51fd\u6570\u76f8\u7ed3\u5408\u3002\u800c\u4e14\u4f7f\u7528JS\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u5904\u7406CSS\u4e2d\u7684\u56fe\u7247\uff08\u5982\u80cc\u666f\u56fe\u7b49\uff09\u3002<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
\u59ff\u52bf\u4e09\uff1a\u4f7f\u7528JS\u89e3\u7801WebP\u56fe\u7247<\/h4>\n
\u65e2\u7136WebP\u7684\u89e3\u7801\u5668\u662f\u5f00\u6e90\u7684\uff0c\u90a3\u4e48\u80fd\u5426\u7528JS\u6765\u5b9e\u73b0\u5462\uff1f\u5f53\u7136\u53ef\u4ee5\uff0c\u6709\u4eba\u5c31\u7528JS\u5199\u51fa\u4e86WebP\u7684\u89e3\u7801\u5668<\/a>\u3002\u5f15\u5165\u8fd9\u4e2aJS\u5e93\uff0c\u5c31\u662f\u5c06\u6240\u6709\u7684WebP\u56fe\u7247\u7528JS\u89e3\u7801\u540e\u8f6c\u6362\u4e3abase64\uff0c\u7136\u540e\u66ff\u6362\u6389\u539f\u6765\u7684URL\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u8ba9\u539f\u672c\u4e0d\u652f\u6301WebP\u7684\u6d4f\u89c8\u5668\u6b63\u5e38\u663e\u793aWebP\u4e86\u3002\u8fd9\u4e2a\u5e93\u7684\u4f7f\u7528\u65b9\u6cd5\u975e\u5e38\u7b80\u5355\uff0c\u770b\u7f51\u9875\u7684\u8bf4\u660e\u5373\u53ef\u3002<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u7684\u7f3a\u70b9\u662f\uff0c\u56e0\u4e3aJS\u8981\u89e3\u7801WebP\u56fe\u7247\uff0c\u9700\u8981\u5728\u6b64\u5f02\u6b65\u8bf7\u6c42src\u4e2d\u7684URL\uff08\u4e0d\u8fc7\u56e0\u4e3a\u56fe\u7247\u672c\u8eab\u4e4b\u524d\u88ab\u4e0b\u8f7d\u4e86\u4e00\u6b21\uff0c\u76f4\u63a5\u4f7f\u7528\u4e86\u7f13\u5b58\uff09\uff1b\u800c\u4e14JS\u89e3\u7801\u6bd4\u8f83\u6162\uff0c\u5bf9\u6027\u80fd\u6709\u5f71\u54cd\uff0c\u53ef\u80fd\u9700\u8981\u4e00\u6bb5\u65f6\u95f4\u624d\u80fd\u663e\u793a\u51fa\u56fe\u7247\u6765\u3002<\/p>\n
\n
\u4ee5\u4e0a\u5c31\u662f\u5728\u6d4f\u89c8\u5668\u4e2d\u4f7f\u7528WebP\u56fe\u7247\u7684\u51e0\u79cd\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6839\u636e\u81ea\u5df1\u7684\u5b9e\u9645\u60c5\u51b5\u9009\u7528\u3002\u5728\u6211\u4eec\u7684\u5b9e\u8df5\u4e2d\uff0c\u4f7f\u7528\u4e86WebP\u683c\u5f0f\u540e\uff0c\u56fe\u7247\u7684\u4f53\u79ef\u666e\u904d\u7f29\u5c0f\u4e861\/3\u4ee5\u4e0a\uff0c\u65e2\u52a0\u5feb\u4e86\u52a0\u8f7d\u7684\u901f\u5ea6\uff0c\u8fd8\u8282\u7701\u4e86\u7528\u6237\u7684\u6d41\u91cf\uff0c\u6211\u4eec\u5341\u5206\u63a8\u8350\u4ece\u73b0\u5728\u5c31\u5f00\u59cb\u4f7f\u7528\u8fd9\u79cd\u683c\u5f0f\u3002<\/p>\n
 <\/p>\n
\u6587\u7ae0\uff1ahttps:\/\/segmentfault.com\/a\/1190000007482148<\/a><\/p>\n
 <\/p>\n
 <\/p>\n
webp\u662f\u8c37\u6b4c\u5f00\u53d1\u7684\u4e00\u4e2a\u56fe\u7247\u683c\u5f0f\uff0c\u8ddf\u666e\u901a\u7684jpg\u6bd4\u8d77\u6765\uff0c\u5982\u679c\u540c\u5927\u5c0f\u7684\u56fe\u7247\u60c5\u51b5\u4e0b\uff0cwebp\u4f1a\u6bd4\u8f83\u6e05\u6670\u3002 \u706b\u72d0\u4e5f\u5f00 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-6920","post","type-post","status-publish","format-standard","hentry","category-11"],"_links":{"self":[{"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/posts\/6920","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6920"}],"version-history":[{"count":0,"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/posts\/6920\/revisions"}],"wp:attachment":[{"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6920"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6920"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6920"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\u4e0d\u8fc7\u53ea\u8981\u4f7f\u7528\u4e86html5shiv<\/a>\uff0c\u4f7f\u65e7\u7684\u6d4f\u89c8\u5668\u652f\u6301\u8fd9\u4e2a\u6807\u7b7e\uff0cCSS\u9009\u62e9\u5668\u5c31\u53ef\u4ee5\u6b63\u5e38\u4f7f\u7528\u4e86\u3002<\/p>\n