{"id":67,"date":"2021-01-17T19:33:07","date_gmt":"2021-01-17T11:33:07","guid":{"rendered":"http:\/\/gjweb.top\/?p=67"},"modified":"2021-01-17T20:05:20","modified_gmt":"2021-01-17T12:05:20","slug":"%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/gjweb.top\/?p=67","title":{"rendered":"String\u7c7b\u578b"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">charCodeAt<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3aUnicode\u7f16\u7801<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>str.charCodeAt()<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">formCharCode<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06Unicode\u7f16\u7801\u4f4f\u8f6c\u56de\u5b57\u7b26<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>fromCharCode(unicode)<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">substring<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u622a\u53d6\u5b57\u7b26\u4e32(\u542b\u5934\u4e0d\u542b\u5c3e)<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>str.substring(\u5f00\u59cb\u4f4d\u7f6e,\u7ed3\u675f\u4f4d\u7f6e)<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">substr<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b57\u7b26\u4e32\u622a\u53d6<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>str.substr(\u5f00\u59cb\u4f4d\u7f6e,\u7ed3\u675f\u4f4d\u7f6e)<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">charAt<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd4\u56de\u6307\u5b9a\u4f4d\u7f6e\u7684\u5b57\u7b26<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>str.charAt(index)<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">toLowercase<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f6c\u5c0f\u5199<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>str.toLowercase()<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">toUppercase<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f6c\u5927\u5199<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>str.toUppercase()<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">indexOf<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u67e5\u627e\u5b57\u7b26\u4e32\u8fd4\u56de\u627e\u5230\u7684\u4f4d\u7f6e,\u5982\u679c\u6ca1\u6709\u8fd4\u56de-1<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>str.indexOf('str')<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">split<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06\u5b57\u7b26\u4e32\u5206\u5272\u4e3a\u7d20\u7ec4,\u9ed8\u8ba4\u4ee5\u9017\u53f7\u5f62\u5f0f\u5206\u79d1,\u53ef\u81ea\u5b9a\u4e49\u5206\u9694\u7b26<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>str.split()<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">StringValue<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd4\u56de\u8be5\u5b57\u7b26\u4e32\u4e0b\u6807\u7684\u5185\u5bb9<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>str.StringValue&#91;index]<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">slice<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b57\u7b26\u4e32\u622a\u53d6(\u542b\u5934\u4e0d\u542b\u5c3e)<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>str.slice()<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">trim<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6e05\u7a7a\u5b57\u7b26\u4e32\u524d\u540e\u7684\u7a7a\u683c<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>str.trim()<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">ES6\u65b0\u589e<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">unicode<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8d85\u51fa\u4e86fff\u7684\u8303\u56f4<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u89e3\u51b3\u8d85\u51fa\u4e0d\u80fd\u6b63\u786e\u4e4b\u522b\u7684\u5b57\u7b26:{}<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let str = '\\u20BB7'\nconsole.log(str)\n\/**es6\u89e3\u51b3 *\/\nlet strEs6 = '\\u{20BB7}'\nconsole.log(strEs6)<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">codePointAt<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u8bc6\u522b32\u4e3a\u7684UTF-16\u5b57\u7b26<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>{\n    function demo (str){\n        return str.codePointAt(0) &gt; 0xFFFF\n    }\n    console.log(demo(\"\u4f60\"))\n    console.log(demo(\"\u5409\"))\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">at<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4fee\u6b63chartAt()\u4e2d\u4e0d\u80fd\u89e3\u91ca\u5927\u4e8e0XFFFF\u5b57\u7b26<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">includes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd4\u56de\u5e03\u5c14\u503c,\u8868\u793a\u662f\u5426\u627e\u5230\u4e86\u53c2\u6570\u5b57\u7b26\u4e32<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u6536\u4e24\u4e2a\u53c2\u6570,\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u67e5\u627e\u7684\u5185\u5bb9,[\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u4ece\u4e0b\u6807\u8bb0\u5f00\u59cb\u5411\u540e\u67e5\u627e]<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">startsWith<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd4\u56de\u5e03\u5c14\u503c,\u8868\u793a\u53c2\u6570\u5b57\u7b26\u4e32\u662f\u5426\u5728\u539f\u5b57\u7b26\u4e32\u7684\u5934\u90e8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u6536\u4e24\u4e2a\u53c2\u6570,\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u67e5\u627e\u7684\u5185\u5bb9,[\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u4ece\u4e0b\u6807\u8bb0\u5f00\u59cb\u5411\u540e\u67e5\u627e]<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">endWith<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd4\u56de\u5e03\u5c14\u503c,\u8868\u793a\u53c2\u6570\u5b57\u7b26\u4e32\u662f\u5426\u5728\u539f\u5b57\u7b26\u4e32\u7684\u5c3e\u90e8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u6536\u4e24\u4e2a\u53c2\u6570,\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u67e5\u627e\u7684\u5185\u5bb9,[\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u4ece\u4e0b\u6807\u8bb0\u5f00\u59cb\u5411\u540e\u67e5\u627e]<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">repeat<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32,\u8868\u793a\u5c06\u539f\u5b57\u7b26\u4e32\u7684\u5c3e\u90e8\u91cd\u590dN\u6b21<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">padStrat(N)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5934\u90e8\u8865\u5168<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">padEnd(N)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c3e\u90e8\u8865\u5168<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u6807\u7b7e\u6a21\u677f<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>alter() === alter``<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u52a0\u5165\u53d8\u91cf,\u4f1a\u628a\u5b57\u7b26\u4e32\u653e\u5165\u5230\u4e00\u4e2a\u6570\u7ec4\u4e2d<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u6a21\u677f\u5b57\u7b26\u4e32<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>`test ${\u53d8\u91cf\u540d} test`<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>charCodeAt \u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3aUnicode\u7f16\u7801 formCharCode \u5c06Unicode\u7f16\u7801\u4f4f\u8f6c\u56de\u5b57 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-67","post","type-post","status-publish","format-standard","hentry","category-javascript"],"_links":{"self":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts\/67","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=67"}],"version-history":[{"count":0,"href":"https:\/\/gjweb.top\/index.php?rest_route=\/wp\/v2\/posts\/67\/revisions"}],"wp:attachment":[{"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=67"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=67"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gjweb.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=67"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}