{"id":237,"date":"2017-08-10T11:32:10","date_gmt":"2017-08-10T03:32:10","guid":{"rendered":"https:\/\/blog.lcsoul.cn\/?p=237"},"modified":"2017-08-10T11:32:10","modified_gmt":"2017-08-10T03:32:10","slug":"javascript-%e5%a4%a7%e6%9d%82%e7%83%a9","status":"publish","type":"post","link":"https:\/\/blog.lcsoul.top\/index.php\/2017\/08\/10\/javascript-%e5%a4%a7%e6%9d%82%e7%83%a9\/","title":{"rendered":"JavaScript \u5927\u6742\u70e9"},"content":{"rendered":"<h2>\u907f\u514d\u6c61\u67d3\u5168\u5c40\u53d8\u91cf<\/h2>\n<pre class=\"prettyprint linenums\" >\nvar foo = 12;\nconsole.log(foo);\n<\/pre>\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u7b49\u540c\u4e8e<\/p>\n<pre class=\"prettyprint linenums\" >\nwindow.foo = 12;\n<\/pre>\n<p>\u5982\u4e0b\u4ee3\u7801\u4f1a\u8986\u76d6\u7cfb\u7edf\u9ed8\u8ba4print\u51fd\u6570\uff0c\u4f1a\u8ba9\u7f51\u9875\u65e0\u6cd5\u6253\u5370\uff1a<\/p>\n<pre class=\"prettyprint linenums\" >\nfunction print () {\n   \/\/ do something\n}\nprint();\n<\/pre>\n<p>\u6211\u4eec\u53ea\u9700\u8981\u7b80\u5355\u7684\u505a\u4e00\u4e0b\u53d8\u66f4\uff0c\u5c31\u80fd\u907f\u514d\u6c61\u67d3\u5168\u5c40\u53d8\u91cf\uff1a<\/p>\n<pre class=\"prettyprint linenums\" >\n(function () {\n   var foo = 12;\n   console.log(window.foo);\n   \/\/ \u2192 undefined\n   console.log(foo);\n   \/\/ \u2192 12\n})();\n<\/pre>\n<p>\u5982\u679c\u66f4\u8fdb\u4e00\u6b65\uff0c\u53ef\u4ee5\u5c06window\u7b49\u5168\u5c40\u53d8\u91cf\u5f53\u4f5c\u53c2\u6570\u4f20\u5230function\uff1a<\/p>\n<pre class=\"prettyprint linenums\" >\n(function (global, doc) {\n  global.setTimeout(function () {\n     doc.body.innerHTML = \"Hello!\";\n  }, 1000);\n})(window, document);\n<\/pre>\n<h2>\u503c\u7c7b\u578b\u8f6c\u6362<\/h2>\n<pre class=\"prettyprint linenums\" >\n\/\/ \u4efb\u4f55\u503c\u8f6c\u4e3aNumber\nvar foo = \"12\";\nvar myNumber = +foo;\n\/\/ \u2192 12\nvar negativeFoo = -foo;\n\/\/ \u2192 -12\n\/\/ \u5bf9\u8c61\u8f6c\u4e3a\u6570\u7ec4\nvar args = { 0: \"foo\", 1: \"bar\", length: 2 };\nArray.prototype.slice.call(args)\n\/\/ \u2192 [ 'foo', 'bar' ]\n\/\/ \u8f6c\u4e3a\u5e03\u5c14\u503c\n\/\/\/ \u6b63\u6b63\u5f97\u6b63\nvar t = 1;\nvar f = 0;\n!!t\n\/\/ \u2192 true\n!!f\n\/\/ \u2192 false\n\/\/\/ \u6b63\u8d1f\u5f97\u8d1f\n!t\n\/\/ \u2192 false\n!f\n\/\/ \u2192 true\n\/\/ \u8f6c\u4e3a\u5b57\u7b26\u4e32\nvar foo = 12;\n\"\" + foo\n\/\/ \u2192 \"12\"\nfoo = { hello: \"world\" };\nJSON.stringify(foo);\n\/\/ \u2192 '{ \"hello\":\"world\" }'\nJSON.stringify(foo, null, 4); \/\/ \u683c\u5f0f\u5316\n\/\/ \u2192\n\/\/ '{\n\/\/    \"hello\": \"world\"\n\/\/ }'\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u907f\u514d\u6c61\u67d3\u5168\u5c40\u53d8\u91cf var foo = 12; console.log(foo); \u4e0a\u9762\u7684\u4ee3\u7801\u7b49\u540c\u4e8e windo [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,10],"tags":[50],"class_list":["post-237","post","type-post","status-publish","format-standard","hentry","category-codeshare","category-share","tag-javascript"],"_links":{"self":[{"href":"https:\/\/blog.lcsoul.top\/index.php\/wp-json\/wp\/v2\/posts\/237","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.lcsoul.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.lcsoul.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.lcsoul.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.lcsoul.top\/index.php\/wp-json\/wp\/v2\/comments?post=237"}],"version-history":[{"count":0,"href":"https:\/\/blog.lcsoul.top\/index.php\/wp-json\/wp\/v2\/posts\/237\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.lcsoul.top\/index.php\/wp-json\/wp\/v2\/media?parent=237"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.lcsoul.top\/index.php\/wp-json\/wp\/v2\/categories?post=237"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.lcsoul.top\/index.php\/wp-json\/wp\/v2\/tags?post=237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}