\u6bcf\u6b21\u904d\u5386\u6570\u636e\u6211\u90fd\u7528for\u5faa\u73af\u57fa\u672c\u90fd\u591f\u65e5\u5e38\u9700\u6c42\u4e86\uff0c\u4f46\u662fjs\u5176\u5b9e\u8fd8\u63d0\u4f9b\u4e86\u5f88\u591a\u9488\u5bf9\u904d\u5386\u5bf9\u8c61\u548c\u6570\u7ec4\u7684\u3002<\/p>\n
\u4e3a\u4e86\u65b9\u4fbf\u7406\u89e3\u8fd9\u91cc\u4e8b\u5148\u521b\u5efa\u4e00\u4e9b\u4f8b\u5b50\uff0c\u63d0\u4f9b\u7ed9\u904d\u5386\u5bf9\u8c61\u65f6\u4f7f\u7528\uff1a<\/p>\n
<\/p>\n
\/\/\u7ee7\u627f ,\u53ea\u8981\u662f\u58f0\u660e\u4e86\u5bf9\u8c61\u6216\u8005\u6570\u7ec4\u90fd\u80fd\u8c03\u7528window.Object.prototype\u91cc\u9762\u7684\u7ee7\u627f\u8fc7\u6765\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\r\nwindow.Object.prototype.userProp = 'userProp11';\r\nwindow.Object.prototype.getUserProp = function() {\r\n return window.Object.prototype.userProp;\r\n};\r\n\r\n\r\n\/\/\u9700\u8981\u904d\u5386\u7684\u5bf9\u8c61\r\nvar obj = {\r\n name: 'percy',\r\n age: 21,\r\n [Symbol('symbol \u5c5e\u6027')]: 'symbolProp',\r\n unEnumerable: '\u6211\u662f\u4e00\u4e2a\u4e0d\u53ef\u679a\u4e3e\u5c5e\u6027',\r\n skills: ['html', 'css', 'js'],\r\n getSkills: function() {\r\n return this.skills;\r\n }\r\n};\r\n\r\n\/\/\u904d\u5386obj\u5bf9\u8c61\u65f6\uff0c\u5ffd\u7565unEnumerable\u5c5e\u6027\r\nwindow.Object.defineProperty(obj, 'unEnumerable', {\r\n enumerable: false\r\n});<\/pre>\n <\/p>\n
\u5bf9\u8c61\u904d\u5386<\/span><\/p>\n\/\/\u63a8\u8350\u904d\u53861\uff1a\u4f1a\u5ffd\u7565\u6389 Symbol\u7c7b\u578b\u5c5e\u6027 \u548c \u4e0d\u5141\u8bb8\u679a\u4e3e\u7684unEnumerable\u5c5e\u6027\r\nfor (var key in obj) {\r\n console.log(key); \/\/name\u3001age\u3001skills\u3001getSkills\u3001userProp\u3001getUserProp\r\n console.log(obj[key]); \/\/ right style\r\n}<\/pre>\n <\/p>\n
\/\/\u904d\u53862\uff1a\u904d\u5386\u5bf9\u8c61\u91cc\u9762\u7684\u5c5e\u6027\u540d \u6216\u8005 \u6570\u7ec4\u7684\u7d22\u5f15\uff0c\u96c6\u5408\u8d77\u6765\u5e76\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\r\nObject.keys(obj); \/\/[\"name\", \"age\", \"skills\", \"getSkills\"] \u4e0d\u5305\u62ecSymbol\u7c7b\u578b\u548c\u7ee7\u627f\u8fc7\u6765\u7684userProp\u548cgetUserProp<\/pre>\n <\/p>\n
\/\/\u904d\u53863\uff1a\u4e0d\u542b Symbol \u7c7b\u578b\u7684\u5c5e\u6027\uff0c\u4e0d\u5305\u542b\u7ee7\u627f\u5c5e\u6027\uff0c\u4f46\u662f\u5305\u62ec\u4e0d\u53ef\u679a\u4e3e\u5c5e\u6027\r\nObject.getOwnPropertyNames(obj); \/\/ [\"name\", \"age\", \"unEnumerable\", \"skills\", \"getSkills\"]<\/pre>\n <\/p>\n
\/\/\u904d\u53864\uff1a\u5305\u542b\u5bf9\u8c61\u81ea\u8eab\u7684\u6240\u6709 Symbol \u7c7b\u578b\u7684\u5c5e\u6027\uff08\u4e0d\u5305\u62ec\u7ee7\u627f\u7684\u5c5e\u6027\uff09\r\nObject.getOwnPropertySymbols(obj); \/\/ [Symbol(symbol \u5c5e\u6027)]<\/pre>\n <\/p>\n
\/\/\u904d\u53865\uff1a\u5305\u542b Symbol \u7c7b\u578b\u7684\u5c5e\u6027\uff0c\u8fd8\u6709\u4e0d\u53ef\u679a\u4e3e\u7684\u5c5e\u6027\uff0c\u4f46\u662f\u4e0d\u5305\u62ec\u7ee7\u627f\u7684\u5c5e\u6027\r\nReflect.ownKeys(obj); \/\/ [\"name\", \"age\", \"unEnumerable\", \"skills\", \"getSkills\", Symbol(symbol \u5c5e\u6027)]<\/pre>\n <\/p>\n
\/\/\u5224\u65ad\u67d0\u4e2a\u5c5e\u6027\u662f\u4e0d\u662f\u67d0\u4e2a\u5bf9\u8c61\u81ea\u8eab\u7684\u5c5e\u6027\uff0c\u517c\u5bb9ie7 (\u4e0d\u5305\u62ec\u7ee7\u627f)\r\nObject.prototype.hasOwnProperty.call(obj,'userProp') \/\/\u8fd4\u56de\u5e03\u5c14\u503c<\/pre>\n <\/p>\n
\/\/\u9996\u5148\u904d\u5386\u6240\u6709\u5c5e\u6027\u540d\u4e3a\u6570\u503c\u7684\u5c5e\u6027\uff0c\u6309\u7167\u6570\u5b57\u6392\u5e8f
\n\/\/\u5176\u6b21\u904d\u5386\u6240\u6709\u5c5e\u6027\u540d\u4e3a\u5b57\u7b26\u4e32\u7684\u5c5e\u6027\uff0c\u6309\u7167\u751f\u6210\u65f6\u95f4\u6392\u5e8f
\n\/\/\u6700\u540e\u904d\u5386\u6240\u6709\u5c5e\u6027\u540d\u4e3aSymbol\u503c\u7684\u5c5e\u6027\uff0c\u6309\u7167\u751f\u6210\u65f6\u95f4\u6392\u5e8f
\n\/\/ (\u591a\u4f7f\u7528console.log()\u6253\u5370\u51fa\u6765\u770b\u770b)<\/p>\n
<\/p>\n
\n
\n <\/p>\n
\u6570\u7ec4\u904d\u5386<\/span><\/p>\n\/\/\u904d\u53861\r\nvar arr=[2,4,6];\r\nfor(var x of arr){\r\n console.log(x); \/\/2,4,6\r\n}<\/pre>\n <\/p>\n
\/\/\u904d\u53862\r\n\/\/ 1,\u4f1a\u4fee\u6539\u539f\u6765\u6570\u7ec4\r\n\/\/ 2,\u5982\u679c\u6570\u7ec4\u5728\u8fed\u4ee3\u65f6\u88ab\u4fee\u6539\u4e86\uff0c\u5219\u6309\u7167\u7d22\u5f15\u7ee7\u7eed\u904d\u5386\u4fee\u6539\u540e\u7684\u6570\u7ec4\r\nvar words = [\"one\", \"two\", \"three\", \"four\"];\r\n\r\nwords.forEach(function(currentValue, index, array) {\r\n console.log(currentValue); \/\/\"one\", \"two\", \"four\"\r\n if (currentValue === \"two\") {\r\n words.shift(); \/\/\u6570\u7ec4\u88ab\u4fee\u6539\u540e\u6309\u7167\u4fee\u6539\u540e\u7684\u6570\u7ec4\u904d\u5386\r\n }\r\n});\r\n\r\nconsole.log(words); \/\/[\"two\", \"three\", \"four\"];<\/pre>\n <\/p>\n
<\/p>\n
\/\/\u904d\u53863\r\n\/\/1,\u8fd4\u56de\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u4e0d\u4f1a\u4fee\u6539\u539f\u6765\u6570\u7ec4\r\nvar arr=[2,4,6];\r\n\r\nvar new_arry=arr.map(function (currentValue,index,array) {\r\n return currentValue+1;\r\n});\r\n\r\nconsole.log(new_arry); \/\/[3, 5, 7]<\/pre>\n <\/p>\n
\u8fd8\u6709\u66f4\u591a\u6570\u7ec4\u7684\u904d\u5386\uff1a(\u600e\u4e48\u7528\u81ea\u5df1\u53bb\u67e5\u5427)<\/p>\n
Array.prototype.every()\r\nfilter()\r\nfind()\r\nfindIndex()\r\nsome()\r\nreduce()\r\nreduceRight()<\/pre>\n <\/p>\n
https:\/\/mp.weixin.qq.com\/s\/C-QEvoBc11gS-J3Kllgbyg<\/a><\/p>\n <\/p>\n