{"id":273,"date":"2020-02-04T20:57:37","date_gmt":"2020-02-04T12:57:37","guid":{"rendered":"https:\/\/blog.cqdefxxx.com\/?p=273"},"modified":"2020-02-04T20:57:37","modified_gmt":"2020-02-04T12:57:37","slug":"%e9%80%bb%e8%be%91%e8%bf%90%e7%ae%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/blog.viter.top\/index.php\/2020\/02\/04\/%e9%80%bb%e8%be%91%e8%bf%90%e7%ae%97%e7%ac%a6\/","title":{"rendered":"\u903b\u8f91\u8fd0\u7b97\u7b26"},"content":{"rendered":"

\uff08\u4e00\uff09\uff1a<\/p>\n

<!DOCTYPE html>\n<html>\n\t<head>\n\t\t<meta charset=\"UTF-8\">\n\t\t<title><\/title>\n\t\t<script type=\"text\/javascript\">\n\t\t\t\n\t\t\t\/*\n\t\t\t * JS\u4e2d\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u4e09\u79cd\u903b\u8f91\u8fd0\u7b97\u7b26\n\t\t\t * ! \u975e\n\t\t\t * \t- !\u53ef\u4ee5\u7528\u6765\u5bf9\u4e00\u4e2a\u503c\u8fdb\u884c\u975e\u8fd0\u7b97\n\t\t\t * \t- \u6240\u8c13\u975e\u8fd0\u7b97\u5c31\u662f\u503c\u5bf9\u4e00\u4e2a\u5e03\u5c14\u503c\u8fdb\u884c\u53d6\u53cd\u64cd\u4f5c\uff0c\n\t\t\t * \t\ttrue\u53d8false\uff0cfalse\u53d8true\n\t\t\t * \t- \u5982\u679c\u5bf9\u4e00\u4e2a\u503c\u8fdb\u884c\u4e24\u6b21\u53d6\u53cd\uff0c\u5b83\u4e0d\u4f1a\u53d8\u5316\n\t\t\t * \t- \u5982\u679c\u5bf9\u975e\u5e03\u5c14\u503c\u8fdb\u884c\u5143\u7d20\uff0c\u5219\u4f1a\u5c06\u5176\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\uff0c\u7136\u540e\u518d\u53d6\u53cd\n\t\t\t * \t\t\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u8be5\u7279\u70b9\uff0c\u6765\u5c06\u4e00\u4e2a\u5176\u4ed6\u7684\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\n\t\t\t * \t\t\u53ef\u4ee5\u4e3a\u4e00\u4e2a\u4efb\u610f\u6570\u636e\u7c7b\u578b\u53d6\u4e24\u6b21\u53cd\uff0c\u6765\u5c06\u5176\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\uff0c\n\t\t\t * \t\t\u539f\u7406\u548cBoolean()\u51fd\u6570\u4e00\u6837\n\t\t\t * \n\t\t\t * && \u4e0e\n\t\t\t * \t- &&\u53ef\u4ee5\u5bf9\u7b26\u53f7\u4e24\u4fa7\u7684\u503c\u8fdb\u884c\u4e0e\u8fd0\u7b97\u5e76\u8fd4\u56de\u7ed3\u679c\n\t\t\t * \t- \u8fd0\u7b97\u89c4\u5219\n\t\t\t * \t\t- \u4e24\u4e2a\u503c\u4e2d\u53ea\u8981\u6709\u4e00\u4e2a\u503c\u4e3afalse\u5c31\u8fd4\u56defalse\uff0c\n\t\t\t * \t\t\t\u53ea\u6709\u4e24\u4e2a\u503c\u90fd\u4e3atrue\u65f6\uff0c\u624d\u4f1a\u8fd4\u56detrue\n\t\t\t * \t\t- JS\u4e2d\u7684\u201c\u4e0e\u201d\u5c5e\u4e8e\u77ed\u8def\u7684\u4e0e\uff0c\n\t\t\t * \t\t\t\u5982\u679c\u7b2c\u4e00\u4e2a\u503c\u4e3afalse\uff0c\u5219\u4e0d\u4f1a\u770b\u7b2c\u4e8c\u4e2a\u503c\n\t\t\t * \n\t\t\t * || \u6216\n\t\t\t * \t- ||\u53ef\u4ee5\u5bf9\u7b26\u53f7\u4e24\u4fa7\u7684\u503c\u8fdb\u884c\u6216\u8fd0\u7b97\u5e76\u8fd4\u56de\u7ed3\u679c\n\t\t\t * \t- \u8fd0\u7b97\u89c4\u5219\uff1a\n\t\t\t * \t\t- \u4e24\u4e2a\u503c\u4e2d\u53ea\u8981\u6709\u4e00\u4e2atrue\uff0c\u5c31\u8fd4\u56detrue\n\t\t\t * \t\t\t\u5982\u679c\u4e24\u4e2a\u503c\u90fd\u4e3afalse\uff0c\u624d\u8fd4\u56defalse\n\t\t\t *\t\t- JS\u4e2d\u7684\u201c\u6216\u201d\u5c5e\u4e8e\u77ed\u8def\u7684\u6216\n\t\t\t * \t\t\t\u5982\u679c\u7b2c\u4e00\u4e2a\u503c\u4e3atrue\uff0c\u5219\u4e0d\u4f1a\u68c0\u67e5\u7b2c\u4e8c\u4e2a\u503c\n\t\t\t *\/\n\t\t\t\n\t\t\t\/\/\u5982\u679c\u4e24\u4e2a\u503c\u90fd\u662ftrue\u5219\u8fd4\u56detrue\n\t\t\tvar result = true && true;\n\t\t\t\n\t\t\t\/\/\u53ea\u8981\u6709\u4e00\u4e2afalse\uff0c\u5c31\u8fd4\u56defalse\n\t\t\tresult = true && false;\n\t\t\tresult = false && true;\n\t\t\tresult = false && false;\n\t\t\t\n\t\t\t\/\/console.log(\"result = \"+result);\n\t\t\t\n\t\t\t\/\/\u7b2c\u4e00\u4e2a\u503c\u4e3atrue\uff0c\u4f1a\u68c0\u67e5\u7b2c\u4e8c\u4e2a\u503c\n\t\t\t\/\/true && alert(\"\u770b\u6211\u51fa\u4e0d\u51fa\u6765\uff01\uff01\");\n\t\t\t\n\t\t\t\/\/\u7b2c\u4e00\u4e2a\u503c\u4e3afalse\uff0c\u4e0d\u4f1a\u68c0\u67e5\u7b2c\u4e8c\u4e2a\u503c\n\t\t\t\/\/false && alert(\"\u770b\u6211\u51fa\u4e0d\u51fa\u6765\uff01\uff01\");\n\t\t\t\n\t\t\t\/\/\u4e24\u4e2a\u90fd\u662ffalse\uff0c\u5219\u8fd4\u56defalse\n\t\t\tresult = false || false;\n\t\t\t\n\t\t\t\/\/\u53ea\u6709\u6709\u4e00\u4e2atrue\uff0c\u5c31\u8fd4\u56detrue\n\t\t\tresult = true || false;\n\t\t\tresult = false || true ;\n\t\t\tresult = true || true ;\n\t\t\t\n\t\t\t\/\/console.log(\"result = \"+result);\n\t\t\t\n\t\t\t\/\/\u7b2c\u4e00\u4e2a\u503c\u4e3afalse\uff0c\u5219\u4f1a\u68c0\u67e5\u7b2c\u4e8c\u4e2a\u503c\n\t\t\t\/\/false || alert(\"123\");\n\t\t\t\n\t\t\t\/\/\u7b2c\u4e00\u4e2a\u503c\u4e3atrue\uff0c\u5219\u4e0d\u518d\u68c0\u67e5\u7b2c\u4e8c\u4e2a\u503c\n\t\t\t\/\/true || alert(\"123\");\n\t\t\t\n\t\t\t\n\t\t\t\n\t\t\tvar a = false;\n\t\t\t\n\t\t\t\/\/\u5bf9a\u8fdb\u884c\u975e\u8fd0\u7b97\n\t\t\ta = !a;\n\t\t\t\n\t\t\t\/\/console.log(\"a = \"+a);\n\t\t\t\n\t\t\tvar b = 10;\n\t\t\tb = !!b;\n\t\t\t\n\t\t\t\/\/console.log(\"b = \"+b);\n\t\t\t\/\/console.log(typeof b);\n\t\t\t\n\t\t<\/script>\n\t<\/head>\n\t<body>\n\t<\/body>\n<\/html>\n<\/code><\/pre>\n
 <\/p>\n
\uff08\u4e8c\uff09\uff1a<\/p>\n
<!DOCTYPE html>\n<html>\n\t<head>\n\t\t<meta charset=\"UTF-8\">\n\t\t<title><\/title>\n\t\t\n\t\t<script type=\"text\/javascript\">\n\t\t\t\n\t\t\t\/*\n\t\t\t * && || \u975e\u5e03\u5c14\u503c\u7684\u60c5\u51b5\n\t\t\t * \t- \u5bf9\u4e8e\u975e\u5e03\u5c14\u503c\u8fdb\u884c\u4e0e\u6216\u8fd0\u7b97\u65f6\uff0c\n\t\t\t * \t\t\u4f1a\u5148\u5c06\u5176\u8f6c\u6362\u4e3a\u5e03\u5c14\u503c\uff0c\u7136\u540e\u518d\u8fd0\u7b97\uff0c\u5e76\u4e14\u8fd4\u56de\u539f\u503c\n\t\t\t * \t- \u4e0e\u8fd0\u7b97\uff1a\n\t\t\t * \t\t- \u5982\u679c\u7b2c\u4e00\u4e2a\u503c\u4e3atrue\uff0c\u5219\u5fc5\u7136\u8fd4\u56de\u7b2c\u4e8c\u4e2a\u503c\n\t\t\t * \t\t- \u5982\u679c\u7b2c\u4e00\u4e2a\u503c\u4e3afalse\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u7b2c\u4e00\u4e2a\u503c\n\t\t\t * \n\t\t\t * \t- \u6216\u8fd0\u7b97\n\t\t\t * \t\t- \u5982\u679c\u7b2c\u4e00\u4e2a\u503c\u4e3atrue\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u7b2c\u4e00\u4e2a\u503c\n\t\t\t * \t\t- \u5982\u679c\u7b2c\u4e00\u4e2a\u503c\u4e3afalse\uff0c\u5219\u8fd4\u56de\u7b2c\u4e8c\u4e2a\u503c\n\t\t\t * \n\t\t\t *\/\n\t\t\t\n\t\t\t\/\/true && true\n\t\t\t\/\/\u4e0e\u8fd0\u7b97\uff1a\u5982\u679c\u4e24\u4e2a\u503c\u90fd\u4e3atrue\uff0c\u5219\u8fd4\u56de\u540e\u8fb9\u7684\n\t\t\tvar result = 5 && 6;\n\t\t\t\n\t\t\t\n\t\t\t\/\/\u4e0e\u8fd0\u7b97\uff1a\u5982\u679c\u4e24\u4e2a\u503c\u4e2d\u6709false\uff0c\u5219\u8fd4\u56de\u9760\u524d\u7684false\n\t\t\t\/\/false && true\n\t\t\tresult = 0 && 2;\n\t\t\tresult = 2 && 0;\n\t\t\t\/\/false &&\u3000false\n\t\t\tresult = NaN && 0;\n\t\t\tresult = 0 && NaN;\n\t\t\t\n\t\t\t\n\t\t\t\/\/true || true\n\t\t\t\/\/\u5982\u679c\u7b2c\u4e00\u4e2a\u503c\u4e3atrue\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u7b2c\u4e00\u4e2a\u503c\n\t\t\tresult = 2 || 1;\n\t\t\tresult = 2 || NaN;\n\t\t\tresult = 2 || 0;\n\t\t\t\n\t\t\t\/\/\u5982\u679c\u7b2c\u4e00\u4e2a\u503c\u4e3afalse\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u7b2c\u4e8c\u4e2a\u503c\n\t\t\tresult = NaN || 1;\n\t\t\tresult = NaN || 0;\n\t\t\t\n\t\t\tresult = \"\" || \"hello\";\n\t\t\t\n\t\t\tresult = -1 || \"\u4f60\u597d\";\n\t\t\t\n\t\t\t\n\t\t\tconsole.log(\"result = \"+result);\n\t\t\t\n\t\t<\/script>\n\t\t\n\t<\/head>\n\t<body>\n\t<\/body>\n<\/html>\n<\/code><\/pre>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
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 <\/p>\n","protected":false},"excerpt":{"rendered":"
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