{"id":189,"date":"2021-02-10T10:07:14","date_gmt":"2021-02-10T02:07:14","guid":{"rendered":"http:\/\/gjweb.top\/?p=189"},"modified":"2021-02-10T10:07:14","modified_gmt":"2021-02-10T02:07:14","slug":"buffer%e7%bc%93%e5%86%b2%e5%99%a8","status":"publish","type":"post","link":"https:\/\/gjweb.top\/?p=189","title":{"rendered":"Buffer\u7f13\u51b2\u5668"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Buffer<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>\u662f\u4e00\u4e2a\u7c7b\u4f3c\u4e8e\u6570\u7ec4\u7684\u5bf9\u8c61,\u4e0d\u540c\u662fBuffer\u662f\u4e13\u95e8\u7528\u6765\u4fdd\u5b58\u4e8c\u8fdb\u5236\u6570\u636e\u7684<\/li><li>\u7279\u70b9<ul><li>\u6548\u7387\u9ad8,\u5b58\u50a8\u548c\u8bfb\u53d6\u5feb,\u76f4\u63a5\u5bf9\u8ba1\u7b97\u673a\u5185\u5b58\u8fdb\u884c\u64cd\u4f5c<\/li><li>\u5927\u5c0f\u4e00\u65e6\u786e\u5b9a\u4e86,\u4e0d\u53ef\u4fee\u6539<\/li><li>\u6bcf\u4e2a\u5143\u7d20\u5360\u7528\u5185\u5b58\u7684\u5927\u5c0f\u4e3a1\u5b57\u8282<\/li><li>\u662fNode\u7684\u6838\u5fc3\u6a21\u5757,\u65e0\u9700\u5f15\u7528\u4e0b\u8f7d,\u5373\u53ef\u4f7f\u7528<\/li><\/ul><\/li><\/ul>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<pre class=\"wp-block-preformatted\">\/\/ \u5b9e\u4f8b\u5316 Buffer\u5bf9\u8c61 --- \u6027\u80fd\u7279\u522b\u5dee<br>let buf = new Buffer(10);<br>\/\/ \u66ff\u4ee3<br>let buf2 = Buffer.alloc() \/\/ \u521b\u5efa\u4e00\u4e2aBuffer\u5bf9\u8c61(\u6027\u80fd\u6bd4new \u7a0d\u5f3a)<br>let buf3 = Buffer.alloUnsafe() \/\/ \u521b\u5efa\u4e00\u4e2aBuffer\u5bf9\u8c61(\u6027\u80fd\u6700\u597d)<br>\/*<br>    1. \u8f93\u51fa buf3 \u91cc\u9762\u6709\u5927\u4e8e1\u7684 ?<br>        \u8f93\u51fa\u7684\u662f16\u8fdb\u5236,\u5b58\u50a8\u7684\u662f\u4e8c\u8fdb\u5236<br>    2. \u8f93\u51fa\u7684 buf3 \u4e0d\u4e3a\u7a7a ?<br>        \u5728\u5806\u91cc\u5f00\u8f9f\u7684\u7a7a\u95f4,\u53ef\u80fd\u6b8b\u7559\u6570\u636e,\u6240\u4ee5allocunsafe<br>        <br>*\/<br>\/\/ \u5c06\u6570\u636e\u5b58\u50a8\u4e00\u4e2aBuffer\u5b9e\u4f8b<br>let buf4 &nbsp;= Buffer.from('hello,world')<br>\/*<br>    1. \u81ea\u52a8\u5b9e\u4f8b\u5316Buffer\u5bf9\u8c61<br>    2. \u8f93\u51fa16\u8fdb\u5236<br>    3. \u901a\u8fc7 .toString() \u8f6c\u6362\u6210\u5b57\u7b26\u4e32<br>*\/<\/pre>\n\n\n\n<p>\u4ee5\u4e0a\u4ee3\u7801\u4e2d<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>buf \u6027\u80fd\u5dee\u7684\u539f\u56e0<ul><li>\u5728\u5806\u91cc\u5f00\u8f9f\u7a7a\u95f4<\/li><li>\u6e05\u7406\u7a7a\u95f4<\/li><\/ul><\/li><li>buf2 \u6027\u80fd\u7a0d\u5fae\u597d\u7684\u539f\u56e0<ul><li>\u5728\u5806\u4e2d\u5f00\u8f9f\u4e00\u4e2a\u7a7a\u95f4<\/li><li>\u8be5\u7a7a\u95f4\u6ca1\u6709\u7528\u8fc7<\/li><\/ul><\/li><li>buf3 \u6027\u80fd\u6700\u597d<ul><li>\u968f\u673a\u5728\u5806\u91cc\u5f00\u8f9f\u7a7a\u95f4<\/li><li>\u53ef\u80fd\u5b58\u5728\u6b8b\u7559\u6570\u636e<\/li><\/ul><\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Buffer \u662f\u4e00\u4e2a\u7c7b\u4f3c\u4e8e\u6570\u7ec4\u7684\u5bf9\u8c61,\u4e0d\u540c\u662fBuffer\u662f\u4e13\u95e8\u7528\u6765\u4fdd\u5b58\u4e8c\u8fdb\u5236\u6570\u636e\u7684 \u7279\u70b9 \u6548\u7387\u9ad8,\u5b58\u50a8\u548c\u8bfb\u53d6\u5feb [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-189","post","type-post","status-publish","format-standard","hentry","category-node"],"_links":{"self":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts\/189","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=189"}],"version-history":[{"count":0,"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts\/189\/revisions"}],"wp:attachment":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=189"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}