{"id":890,"date":"2022-03-10T21:04:22","date_gmt":"2022-03-10T13:04:22","guid":{"rendered":"http:\/\/www.henrycome.com\/wordpress\/?p=890"},"modified":"2022-03-10T21:22:13","modified_gmt":"2022-03-10T13:22:13","slug":"20220310210413","status":"publish","type":"post","link":"http:\/\/www.henrycome.com\/wordpress\/202203102104\/890","title":{"rendered":"P6-7-\u53d8\u91cf->\u5e38\u91cf.js"},"content":{"rendered":"<pre><code class=\"language-javascript\">\/*P6-\u57fa\u7840-\u53d8\u91cf\nvar name;\nconsole.log(name)\n\n\/\/\u89e3\u91ca\uff1a\n\/\/\u663e\u793a\u7a7a\uff0c\u65e0\u4efb\u4f55\u5185\u5bb9\uff0c\u4e5f\u4e0d\u4f1aundefined,\u770b\u6765undefined\u5c31\u662f\u6ca1\u6709\u5b9a\u4e49\u7684\u3002\n\/\/\u4e0a\u9762\u7684\u8bf4\u6cd5\u662f\u4e0d\u5bf9\u7684\uff0c\u56e0\u4e3aname\u662f\u4fdd\u7559\u5b57\uff08\u6d89\u53ca\u5230html\u7684\u4fdd\u7559\u5b57\u4e5f\u5c3d\u91cf\u907f\u514d\u4f7f\u7528\uff09\uff0c\u4e00\u822c\u672a\u521d\u59cb\u5316\u90fd\u662fundefined\u3002\n\/\/\u5b9a\u4e49\uff0c\u8d4b\u503c\uff0c\u521d\u59cb\u5316\uff08\u7b2c\u4e00\u6b21\u8d4b\u503c\u662f\u521d\u59cb\u5316\uff09\uff0c\u6539\u53d8\u65f6\u4e0d\u5fc5\u7528var\u3002\n\nvar boyName\/\/\u5b9a\u4e49\nboyName=&#039;Tom&#039;\/\/\u8d4b\u503c\uff0c\u521d\u59cb\u5316\n\n\/\/\u53ef\u4ee5\u4e00\u884c\u5b8c\u6210\nvar boyName = &#039;Tom&#039;\nboyName=&#039;Lilei&#039;\n\n\/\/\u53d8\u91cf\u547d\u540d\u89c4\u5219\uff1a\u6709\u542b\u4e49\uff0c\u7b2c\u4e00\u4e2a\u5b57\u7b26\u5fc5\u987b\u662f\u5b57\u6bcd\u6216\u8005\u4e0b\u6362\u7ebf\uff0c\u4e0d\u80fd\u662f\u6570\u5b57\u6216\u5176\u4ed6\u5b57\u7b26\n\/\/\u533a\u5206\u5927\u5c0f\u5199\uff0cName\u548cname\u4e0d\u662f\u4e00\u4e2a\u53d8\u91cf\n\/\/\u9a7c\u5cf0\u547d\u540d\u6cd5\uff0c\u7b2c\u4e00\u4e2a\u5355\u8bcd\u9996\u5b57\u6bcd\u5c0f\u5199\uff0c\u540e\u9762\u5355\u8bcd\u9996\u5b57\u6bcd\u5927\u5199\n\/\/\u4f7f\u7528\u4e0b\u5212\u7ebf\u5206\u5272\u5355\u8bcd\uff0c\u5355\u8bcd\u9996\u5b57\u6bcd\u7528\u5c0f\u5199\n\n\/\/\u53d8\u91cf\u53ef\u4ee5\u63a5\u6536\u51e0\u79cd\u7c7b\u578b\uff0c\u4ee5\u53ca\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u3002\nvar a = 5;\nvar b = 6;\n\nvar c = a+b;\/\/\u8fd9\u5c31\u50cf\u662f\u89e3\u65b9\u7a0b\uff0cx=2+5\uff0cx=7\u662f\u4e00\u6837\u7684\u3002\n\n\/\/\u4e0b\u9762\u4e24\u4e2a\u7ed3\u679c\u662f\u4e00\u6837\u7684\n\/\/\u56e0\u4e3a\u8868\u8fbe\u5f0f\u4f1a\u8fd0\u7b97\uff0c\u7136\u540e\u5f97\u5230\u7ed3\u679c\u3002\n\/\/\u518d\u4ea4\u7ed9console.log()\u6765\u663e\u793a\n\/\/\u6240\u4ee5\uff0c\u4ee5\u540e\u7f16\u7a0b\u7684\u65f6\u5019\uff0c\u89c1\u5230\u9700\u8981\u7ed3\u679c\u7684\u5730\u65b9\uff0c\u51fa\u73b0\u8868\u8fbe\u5f0f\uff0c\u4e0d\u8981\u592a\u60ca\u8bb6\u3002\n\nconsole.log(a+b)\/\/11\nconsole.log(c)\/\/11\n\n\/** *\/\n\n\/*P7-\u57fa\u7840-\u5e38\u91cf\n\/\/\u5e38\u91cf\u5b9a\u4e49\u65b9\u6cd5\uff1aconst\n\n\/\/\u547d\u540d\u89c4\u5219\uff0c\u5168\u90e8\u5927\u5199\uff0c\u5355\u8bcd\u95f4\u7528\u4e0b\u5212\u7ebf\u5206\u5272\uff0c\n\/\/\u597d\u5904\u662f\u6bd45*1000\u6beb\u79d2\u597d\u8ba4\u3002\n\nconst FIVE_SECOND = 5000;\n\n\/\/\u4e0d\u80fd\u91cd\u65b0\u8d4b\u503c,\u62a5\u9519\n\/\/\u72ec\u7279\u7684\u5b9a\u4e49\u65b9\u5f0f\uff0c\u907f\u514d\u5e38\u91cf\u88ab\u8bef\u6539\n\nFIVE_SECOND = 6000;\/\/index.js:10 Uncaught TypeError: Assignment to constant variable. at index.js:10\n\n\/\/\u8001\u5e08\u4e3e\u4f8b\uff0c\u6bd4\u5982,\u4e0d\u60f3\u5b9e\u4f8bbutton\u88ab\u6539\u53d8\uff0c\u91c7\u7528\u4e0b\u9762\u7684\u65b9\u5f0f\nconst button = new button()\n\n\/** *\/<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\/*P6-\u57fa\u7840-\u53d8\u91cf var name; console.log(name) \/\/\u89e3\u91ca\uff1a \/\/\u663e\u793a\u7a7a\uff0c\u65e0\u4efb\u4f55\u5185 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[],"_links":{"self":[{"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/posts\/890"}],"collection":[{"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/comments?post=890"}],"version-history":[{"count":2,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/posts\/890\/revisions"}],"predecessor-version":[{"id":903,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/posts\/890\/revisions\/903"}],"wp:attachment":[{"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/media?parent=890"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/categories?post=890"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.henrycome.com\/wordpress\/wp-json\/wp\/v2\/tags?post=890"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}