{"id":3060,"date":"2014-09-19T20:27:35","date_gmt":"2014-09-19T12:27:35","guid":{"rendered":"https:\/\/sdeno.com\/?p=3060"},"modified":"2016-07-16T00:10:28","modified_gmt":"2016-07-15T16:10:28","slug":"js%e4%bd%9c%e7%94%a8%e5%9f%9f%e6%8e%a2%e8%ae%a8","status":"publish","type":"post","link":"https:\/\/sdeno.com\/?p=3060","title":{"rendered":"js\u4f5c\u7528\u57df\u63a2\u8ba8"},"content":{"rendered":"<pre>var a = \"hello\";\r\n b = \"world\";\r\n\r\nTest();\r\n\r\nfunction Test() {\r\n  alert(a + \" \" + b);\r\n  var a = \"welcome\";\r\n  b = \"china\";\r\n  alert(a + \" \" + b);\r\n}\r\n\r\nalert(a + \" \" + b);\r\n\r\n\u89e3\u6790\uff1a\r\n\r\n\r\nvar a = \"hello\";\r\n b = \"world\";\r\n\r\nTest();\r\n\r\nfunction Test() {\r\n<span style=\"color: rgb(255, 0, 0);\"> var a=undefined; \/\/\u56e0\u4e3a\u51fd\u6570\u91cc\u9762\u6709 var a\u5173\u952e\u8bcd\u6240\u4ee5\u5728\u51fd\u6570\u7684\u524d\u9762\u5c31\u4f1a\u521d\u59cb\u503c\u4e3aundefined<\/span>\r\n alert(a + \" \" + b);  \/\/a\u627e\u5230\u7684\u662f\u4e0a\u9762\u7684undefined  \uff0cb\u627e\u5230\u7684\u662ffunction\u5916\u9762\u7684world\r\n var a = \"welcome\";\r\n b = \"china\";\r\n alert(a + \" \" + b);  \/\/a\u627e\u5230\u7684\u662f\u51fd\u6570\u91cc\u9762\u7684welcome  \uff0cb\u627e\u5230\u7684\u662f\u51fd\u6570\u91cc\u9762\u7684china\r\n}\r\n\r\nalert(a + \" \" + b); \/\/a\u627e\u7684\u662f\u5168\u5c40\u7684hello\uff0c\u51fd\u6570\u91cc\u9762\u7684a\u662f\u5c40\u90e8\u7684\u627e\u4e0d\u5230\uff0cb\u627e\u7684\u662fchina\u5df2\u7ecf\u88ab\u51fd\u6570\u4e2d\u7684 b = \"china\"\u7ed9\u8986\u76d6\u4e86\u8fd9\u662f\u58f0\u660e\u5168\u5c40\u53d8\u91cf\r\n\r\n<\/pre>\n<pre> \u5f53\u51fd\u6570\u91cc\u9762\u6709\u53d8\u91cf\u4e0d\u7ba1\u662f\u58f0\u660e\u5728\u6700\u524d\u8fd8\u662f\u6700\u540e\u4e00\u65e6\u6709var\u90fd\u4f1a\u5148\u4e3a\u53d8\u91cf\u8d4b\u503c\u4e00\u4e2aundefined\uff0c\u5b9a\u4e49\u5728\u6700\u524d\u9762\u3002\r\n \u5982\u679c\u51fd\u6570\u91cc\u9762\u6ca1\u6709\u627e\u5230var\u7684\u53d8\u91cf\u5c31\u4f1a\u8dd1\u5230\u51fd\u6570\u5916\u53bb\u5bfb\u627e\u5bf9\u5e94\u7684\u3002<\/pre>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u5206\u522b\u8f93\u51fa\u7684\u7ed3\u679c\u662f\uff1aundefined world\uff0cwelcome china, hello china.<\/p>\n<p><a href=\"http:\/\/kb.cnblogs.com\/page\/55178\/\" target=\"_blank\">http:\/\/kb.cnblogs.com\/page\/55178\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>var a = &#8220;hello&#8221;; b = &#8220;world&#8221;; Test(); function Test() { [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,11],"tags":[],"class_list":["post-3060","post","type-post","status-publish","format-standard","hentry","category-javascript","category-11"],"_links":{"self":[{"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/posts\/3060","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=3060"}],"version-history":[{"count":0,"href":"https:\/\/sdeno.com\/index.php?rest_route=\/wp\/v2\/posts\/3060\/revisions"}],"wp:attachment":[{"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3060"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3060"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sdeno.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3060"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}