{"id":167,"date":"2021-02-26T13:37:50","date_gmt":"2021-02-26T05:37:50","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/javascript\/?p=167"},"modified":"2021-02-26T13:58:34","modified_gmt":"2021-02-26T05:58:34","slug":"js-%e8%bf%90%e7%ae%97%e7%ac%a6-2","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/javascript\/post-167.html","title":{"rendered":"Js \u8fd0\u7b97\u7b26: !, =, ==, ==="},"content":{"rendered":"\n

\u8fd9\u91cc\u4ecb\u7ecd Js \u8fd0\u7b97\u7b26\uff1a!\uff0c=\uff0c==\uff0c===<\/p>\n\n\n\n

1.\u53d6\u53cd\u8fd0\u7b97\u7b26\uff1a\uff01<\/h5>\n\n\n\n

\u80fd\u628a\u4e00\u4e2a\u5e03\u5c14\u503c\u7684\u503c\u53d6\u53cd\uff0c\u5176\u4ed6\u6570\u636e\u7c7b\u578b\u4f1a\u81ea\u52a8\u6362\u5316\u4e3a\u5e03\u5c14<\/p>\n\n\n\n

var b1 = true;\nvar b2 = !b1;  \/\/\u5219b2\u7684\u503c\u662ffalse\nvar b3 = !!\"abc\"; \/\/\u975e\u7a7a\u5b57\u7b26\u4e32\u90fd\u662ftrue\nvar b4 = !!\"\";  \/\/\u7a7a\u5b57\u7b26\u4e32\u662ffalse\nvar b5 = !!6; \/\/\u975e0\uff0c\u975eNaN \u7684\u6570\u5b57\u7c7b\u578b\u90fd\u662ftrue\nvar b6 = !!0; \/\/0\u662ffalse\nvar b7 = !!NaN; \/\/NaN\u662ffalse\nvar b8 = !!null ; \/\/null\u7c7b\u578b\u662ffalse\nvar b9 = !!undefined;  \/\/undefined\u7c7b\u578b\u4e5f\u662ffalse<\/code><\/pre>\n\n\n\n
2.\u8d4b\u503c\u8fd0\u7b97\u7b26<\/h5>\n\n\n\n
\u628a\u53f3\u8fb9\u7684\u503c\uff0c\u8d4b\u503c\u7ed9\u5de6\u8fb9\u7684\u53d8\u91cf<\/p>\n\n\n\n
var a = 2;\nvar b = true;<\/code><\/pre>\n\n\n\n
3.\u6052\u7b49\u4e8e\u8fd0\u7b97\u7b26: ==<\/h5>\n\n\n\n
\u6bd4\u8f83\u5de6\u53f3 2 \u8fb9\u7684\u503c\u662f\u5426\u76f8\u7b49<\/p>\n\n\n\n
var d1 = 1==true;  \/\/true\nvar d2 = 2==true;  \/\/false\nvar d3 = 1==2;     \/\/false<\/code><\/pre>\n\n\n\n
4.\u5168\u7b49\u4e8e\u8fd0\u7b97\u7b26\uff1a===<\/h5>\n\n\n\n
\u5148\u6bd4\u8f83\u5de6\u53f3\u4e24\u8fb9\u6570\u636e\u7c7b\u578b\u662f\u5426\u76f8\u540c\uff0c\u7c7b\u578b\u76f8\u540c\u65f6\u518d\u6bd4\u8f83\u5b83\u4eec\u7684\u503c\u662f\u5426\u76f8\u7b49<\/p>\n\n\n\n
var q1 = 1===true;  \/\/false\nvar q2 = 1===1;   \/\/true;\nvar q3 = 1===2;    \/\/false<\/code><\/pre>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u8fd9\u91cc\u4ecb\u7ecd Js \u8fd0\u7b97\u7b26\uff1a!\uff0c=\uff0c==\uff0c=== 1.\u53d6\u53cd\u8fd0\u7b97\u7b26\uff1a\uff01 \u80fd\u628a\u4e00\u4e2a\u5e03\u5c14\u503c\u7684\u503c\u53d6\u53cd\uff0c\u5176\u4ed6\u6570\u636e\u7c7b\u578b\u4f1a\u81ea\u52a8\u6362… \u7ee7\u7eed\u9605\u8bfb Js \u8fd0\u7b97\u7b26: !, =, ==, ===<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts\/167"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/comments?post=167"}],"version-history":[{"count":3,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts\/167\/revisions"}],"predecessor-version":[{"id":172,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts\/167\/revisions\/172"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/media?parent=167"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/categories?post=167"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/tags?post=167"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}