{"id":263,"date":"2020-02-04T20:33:18","date_gmt":"2020-02-04T12:33:18","guid":{"rendered":"https:\/\/blog.cqdefxxx.com\/?p=263"},"modified":"2020-02-04T20:33:18","modified_gmt":"2020-02-04T12:33:18","slug":"%e8%bf%90%e7%ae%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/blog.viter.top\/index.php\/2020\/02\/04\/%e8%bf%90%e7%ae%97%e7%ac%a6\/","title":{"rendered":"\u8fd0\u7b97\u7b26"},"content":{"rendered":"<pre class=\"pure-highlightjs\"><code class=\"\">&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n\t&lt;head&gt;\n\t\t&lt;meta charset=\"UTF-8\"&gt;\n\t\t&lt;title&gt;&lt;\/title&gt;\n\t\t&lt;script type=\"text\/javascript\"&gt;\n\t\t\t\n\t\t\t\/*\n\t\t\t * \u8fd0\u7b97\u7b26\u4e5f\u53eb\u64cd\u4f5c\u7b26\n\t\t\t * \t\u901a\u8fc7\u8fd0\u7b97\u7b26\u53ef\u4ee5\u5bf9\u4e00\u4e2a\u6216\u591a\u4e2a\u503c\u8fdb\u884c\u8fd0\u7b97,\u5e76\u83b7\u53d6\u8fd0\u7b97\u7ed3\u679c\n\t\t\t * \t\u6bd4\u5982\uff1atypeof\u5c31\u662f\u8fd0\u7b97\u7b26\uff0c\u53ef\u4ee5\u6765\u83b7\u5f97\u4e00\u4e2a\u503c\u7684\u7c7b\u578b\n\t\t\t * \t\t\u5b83\u4f1a\u5c06\u8be5\u503c\u7684\u7c7b\u578b\u4ee5\u5b57\u7b26\u4e32\u7684\u5f62\u5f0f\u8fd4\u56de\n\t\t\t * \t\tnumber string boolean undefined object\n\t\t\t * \n\t\t\t * \t\u7b97\u6570\u8fd0\u7b97\u7b26\n\t\t\t * \t\t\u5f53\u5bf9\u975eNumber\u7c7b\u578b\u7684\u503c\u8fdb\u884c\u8fd0\u7b97\u65f6\uff0c\u4f1a\u5c06\u8fd9\u4e9b\u503c\u8f6c\u6362\u4e3aNumber\u7136\u540e\u5728\u8fd0\u7b97\n\t\t\t * \t\t\t\u4efb\u4f55\u503c\u548cNaN\u505a\u8fd0\u7b97\u90fd\u5f97NaN\n\t\t\t * \n\t\t\t * \t\t+\n\t\t\t * \t\t\t+\u53ef\u4ee5\u5bf9\u4e24\u4e2a\u503c\u8fdb\u884c\u52a0\u6cd5\u8fd0\u7b97\uff0c\u5e76\u5c06\u7ed3\u679c\u8fd4\u56de\n\t\t\t * \t\t\t \u5982\u679c\u5bf9\u4e24\u4e2a\u5b57\u7b26\u4e32\u8fdb\u884c\u52a0\u6cd5\u8fd0\u7b97\uff0c\u5219\u4f1a\u505a\u62fc\u4e32\n\t\t\t * \t\t\t\t\u4f1a\u5c06\u4e24\u4e2a\u5b57\u7b26\u4e32\u62fc\u63a5\u4e3a\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5e76\u8fd4\u56de\n\t\t\t * \t\t\t\u4efb\u4f55\u7684\u503c\u548c\u5b57\u7b26\u4e32\u505a\u52a0\u6cd5\u8fd0\u7b97\uff0c\u90fd\u4f1a\u5148\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff0c\u7136\u540e\u518d\u548c\u5b57\u7b26\u4e32\u505a\u62fc\u4e32\u7684\u64cd\u4f5c\n\t\t\t * \t\t-\n\t\t\t * \t\t\t- \u53ef\u4ee5\u5bf9\u4e24\u4e2a\u503c\u8fdb\u884c\u51cf\u6cd5\u8fd0\u7b97\uff0c\u5e76\u5c06\u7ed3\u679c\u8fd4\u56de\n\t\t\t * \n\t\t\t * \t\t*\n\t\t\t * \t\t\t* \u53ef\u4ee5\u5bf9\u4e24\u4e2a\u503c\u8fdb\u884c\u4e58\u6cd5\u8fd0\u7b97\n\t\t\t * \t\t\/\n\t\t\t * \t\t\t\/ \u53ef\u4ee5\u5bf9\u4e24\u4e2a\u503c\u8fdb\u884c\u9664\u6cd5\u8fd0\u7b97\n\t\t\t * \t\t%\n\t\t\t * \t\t\t% \u53d6\u6a21\u8fd0\u7b97\uff08\u53d6\u4f59\u6570\uff09\n\t\t\t *\/\n\t\t\tvar a = 123;\n\t\t\t\n\t\t\tvar result = typeof a;\n\t\t\t\n\t\t\t\/\/console.log(typeof result);\n\t\t\t\n\t\t\tresult = a + 1;\n\t\t\t\n\t\t\tresult = 456 + 789;\n\t\t\t\n\t\t\tresult = true + 1;\n\t\t\t\n\t\t\tresult = true + false;\n\t\t\t\n\t\t\tresult = 2 + null;\n\t\t\t\n\t\t\tresult = 2 + NaN;\n\t\t\t\n\t\t\tresult = \"\u4f60\u597d\" + \"\u5927\u5e05\u54e5\";\n\t\t\t\n\t\t\tvar str = \"\u9504\u79be\u65e5\u5f53\u5348\uff0c\" +\n\t\t\t\t\t  \"\u6c57\u6ef4\u79be\u4e0b\u571f\uff0c\" +\n\t\t\t\t\t  \"\u8c01\u77e5\u76d8\u4e2d\u9910\uff0c\" +\n\t\t\t\t\t  \"\u7c92\u7c92\u7686\u8f9b\u82e6\";\n\t\t\t\t\t  \n\t\t\t\t\t  \n\t\t\tresult = 123 + \"1\";\n\t\t\t\n\t\t\tresult = true + \"hello\";\n\t\t\t\n\t\t\t\/\/\u4efb\u4f55\u503c\u548c\u5b57\u7b26\u4e32\u76f8\u52a0\u90fd\u4f1a\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff0c\u5e76\u505a\u62fc\u4e32\u64cd\u4f5c\n\t\t\t\/*\n\t\t\t * \u6211\u4eec\u53ef\u4ee5\u5229\u7528\u8fd9\u4e00\u7279\u70b9\uff0c\u6765\u5c06\u4e00\u4e2a\u4efb\u610f\u7684\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3aString\n\t\t\t * \t\u6211\u4eec\u53ea\u9700\u8981\u4e3a\u4efb\u610f\u7684\u6570\u636e\u7c7b\u578b + \u4e00\u4e2a \"\" \u5373\u53ef\u5c06\u5176\u8f6c\u6362\u4e3aString\n\t\t\t * \t\u8fd9\u662f\u4e00\u79cd\u9690\u5f0f\u7684\u7c7b\u578b\u8f6c\u6362\uff0c\u7531\u6d4f\u89c8\u5668\u81ea\u52a8\u5b8c\u6210\uff0c\u5b9e\u9645\u4e0a\u5b83\u4e5f\u662f\u8c03\u7528String()\u51fd\u6570\n\t\t\t *\/\n\t\t\tvar c = 123;\n\t\t\t\n\t\t\tc = c + \"\";\n\t\t\t\n\t\t\t\/\/c = null;\n\t\t\t\n\t\t\t\/\/c = c + \"\";\n\t\t\t\n\t\t\t\n\t\t\t\/\/console.log(result);\n\t\t\t\/\/console.log(typeof c);\n\t\t\t\/\/console.log(\"c = \"+c);\n\t\t\t\n\t\t\tresult = 1 + 2 + \"3\"; \/\/33\n\t\t\t\n\t\t\tresult = \"1\" + 2 + 3; \/\/123\n\t\t\t\n\t\t\tresult = 100 - 5;\n\t\t\t\n\t\t\tresult = 100 - true;\n\t\t\t\n\t\t\tresult = 100 - \"1\";\n\t\t\t\n\t\t\tresult = 2 * 2;\n\t\t\t\n\t\t\tresult = 2 * \"8\";\n\t\t\t\n\t\t\tresult = 2 * undefined;\n\t\t\t\n\t\t\tresult = 2 * null;\n\t\t\t\n\t\t\tresult = 4 \/ 2;\n\t\t\t\n\t\t\tresult = 3 \/ 2;\n\t\t\t\n\t\t\t\/*\n\t\t\t * \u4efb\u4f55\u503c\u505a- * \/\u8fd0\u7b97\u65f6\u90fd\u4f1a\u81ea\u52a8\u8f6c\u6362\u4e3aNumber\n\t\t\t * \t\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u8fd9\u4e00\u7279\u70b9\u505a\u9690\u5f0f\u7684\u7c7b\u578b\u8f6c\u6362\n\t\t\t * \t\t\u53ef\u4ee5\u901a\u8fc7\u4e3a\u4e00\u4e2a\u503c -0 *1 \/1\u6765\u5c06\u5176\u8f6c\u6362\u4e3aNumber\n\t\t\t * \t\t\u539f\u7406\u548cNumber()\u51fd\u6570\u4e00\u6837\uff0c\u4f7f\u7528\u8d77\u6765\u66f4\u52a0\u7b80\u5355\n\t\t\t *\/\n\t\t\t\n\t\t\tvar d = \"123\";\n\t\t\t\n\t\t\t\/\/console.log(\"result = \"+result);\n\t\t\t\n\t\t\td = d - 0;\n\t\t\t\n\t\t\t\/*console.log(typeof d);\n\t\t\tconsole.log(d);*\/\n\t\t\t\n\t\t\tresult = 9 % 3;\n\t\t\tresult = 9 % 4;\n\t\t\tresult = 9 % 5;\n\t\t\t\n\t\t\tconsole.log(\"result = \"+result);\n\t\t\t\n\t\t&lt;\/script&gt;\n\t&lt;\/head&gt;\n\t&lt;body&gt;\n\t&lt;\/body&gt;\n&lt;\/html&gt;\n<\/code><\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta charset= &#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[4],"_links":{"self":[{"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/posts\/263"}],"collection":[{"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/comments?post=263"}],"version-history":[{"count":0,"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/posts\/263\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/media?parent=263"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/categories?post=263"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.viter.top\/index.php\/wp-json\/wp\/v2\/tags?post=263"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}