{"id":2027,"date":"2021-10-26T08:48:07","date_gmt":"2021-10-26T00:48:07","guid":{"rendered":"https:\/\/www.yusian.com\/blog\/?p=2027"},"modified":"2021-10-26T08:48:07","modified_gmt":"2021-10-26T00:48:07","slug":"es6%e4%b8%adproxy%e7%9a%84%e5%9f%ba%e6%9c%ac%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/javascript\/2021\/10\/26\/0848072027.html","title":{"rendered":"ES6\u4e2dProxy\u7684\u57fa\u672c\u4f7f\u7528"},"content":{"rendered":"

1\u3001\u521d\u59cb\u5316\u7684\u51e0\u79cd\u65b9\u5f0f<\/h2>\n

1.1\u3001Proxy\u5173\u8054\u539f\u59cb\u5bf9\u8c61<\/h3>\n
let obj = {\n    name: 'sian'\n}\n\/**\n * new Proxy(target, handler);\n * \u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u539f\u59cb\u5bf9\u8c61\n * \u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u62e6\u622a\u884c\u4e3a\n *\/\nlet proxy = new Proxy(obj, {\n    get: function(target, prop) {\n        return 'xxx'\n    }\n});\nobject.name \/\/ sian\nproxy.name \/\/ xxx\n<\/code><\/pre>\n
1.2\u3001\u901a\u8fc7\u7ee7\u627f\u7684\u65b9\u5f0f\u5b9e\u73b0\u4ee3\u7406<\/h3>\n
\u5373\uff1aProxy\u505a\u4e3a\u5176\u4ed6\u5bf9\u8c61\u7684\u539f\u578b\u5bf9\u8c61<\/p>\n
let proxy = new Proxy({}, {\n    get: function(target, prop) {\n        return 'xxx'\n    }\n})\nlet obj = Object.create(proxy);\n\/\/ obj\u5e76\u6ca1\u6709time\u5c5e\u6027\uff0c\u6839\u636e\u539f\u578b\u94fe\uff0c\u6700\u7ec8\u4f1a\u5230proxy\u5bf9\u8c61\u4e0a\u8bfb\u53d6\nobj.name \/\/ xxx\nlet person = {\n    age: 10\n}\nObject.setPrototypeOf(person, proxy);\nperson.name \/\/ xxx\n<\/code><\/pre>\n
2\u3001\u5b9e\u4f8b\u65b9\u6cd5<\/h2>\n
2.1\u3001get(target, propKey, receiver)<\/h3>\n
\u62e6\u622a\u5bf9\u8c61\u5c5e\u6027\u7684\u8bfb\u53d6\uff0c\u6bd4\u5982proxy.foo<\/code>\u548cproxy['foo']<\/code><\/p>\n
    \n
  • \u6570\u7ec4\u8d1f\u6570\u7d22\u5f15\u5b9e\u73b0\u5012\u5e8f\u53d6\u503c\uff08\u5982\uff1a-1\u53d6\u6700\u540e\u4e00\u4e2a\u5bf9\u8c61\uff09<\/li>\n<\/ul>\n
    function CreateArray(...elements) {\n    let target = [];\n    let handler = {\n        get: function (target, propKey, receiver) {\n            let index = Number(propKey);\n            if (index < 0) {\n                index = target.length + index;\n            }\n            return Reflect.get(target, String(index), receiver);\n        }\n    }\n    target.push(...elements);\n    let proxy = new Proxy(target, handler);\n    return proxy;\n}\n\nlet array = CreateArray(1, 2, 3, 4, 5);\n\nconsole.log('array[-1]: ', array[-1]) \/\/ array[-1]: 5\n<\/code><\/pre>\n
      \n
    • \u8bfb\u53d6\u64cd\u4f5c\u8f6c\u4e3a\u6267\u884c\u67d0\u4e2a\u51fd\u6570\uff0c\u5b9e\u73b0\u5c5e\u6027\u7684\u94fe\u5f0f\u64cd\u4f5c<\/li>\n<\/ul>\n
      function Pipe(value) {\n    \/\/ \u5b58\u50a8\u94fe\u5f0f\u8c03\u7528\u51fd\u6570\n    let funcStack = [];\n    let proxy = new Proxy({}, {\n        get: function (target, propKey) {\n            \/\/ \u53d6\u503c\n            if (propKey === 'get') {\n                return funcStack.reduce((preValue, func) => func(preValue), value)\n            }\n            \/\/ \u94fe\u5f0f\u8c03\u7528\uff0c\u5c06\u51fd\u6570\u538b\u5165\u8c03\u7528\u6808\uff0c\u53d6\u503c\u65f6\u9010\u4e2a\u8c03\u53d6\n            else {\n                funcStack.push(window[propKey])\n            }\n            return proxy;\n        }\n    })\n    return proxy;\n}\n\nvar double = value => value * 2;\nvar pow = value => value * value;\n\nlet ret = Pipe(3).double.pow.get;\nconsole.log('ret: ', ret); \/\/ ret: 36\n<\/code><\/pre>\n
        \n
      • get\u65b9\u6cd5\u7684\u7b2c\u4e09\u4e2a\u53c2\u6570receiver<\/code>\u6307\u7684\u662f\u8c03\u7528\u8005\u672c\u8eab\uff0c\u5982\u679c\u662fproxy\u5bf9\u8c61\u8c03\u7528\u5219\u4e3aproxy\u5bf9\u8c61\uff0c\u5982\u679c\u539f\u59cb\u5bf9\u8c61\u8c03\u7528\u5219\u4e3a\u539f\u59cb\u5bf9\u8c61<\/li>\n<\/ul>\n
        let proxy = new Proxy({}, {\n    get: function(target, propKey, receiver) {\n        return receiver;\n    }\n})\n\n\/\/ \u4ee3\u7406\u5bf9\u8c61\u8c03\u7528\u65b9\u6cd5\uff0c\u5219receiver\u4e3a\u4ee3\u7406\u5bf9\u8c61\nlet ret = proxy.getReceiver === proxy\nconsole.log('ret: ', ret);\n\n\/\/ \u901a\u8fc7\u539f\u578b\u94fe\u7684\u65b9\u5f0f\u521b\u5efa\u4ee3\u7406\uff0c\u4f7f\u7528\u539f\u59cb\u5bf9\u8c61\u8c03\u7528\u65b9\u6cd5\uff0creceiver\u4e3a\u539f\u59cb\u5bf9\u8c61\nlet obj = Object.create(proxy);\nlet ret2 = obj.getReceiver === obj;\nconsole.log('ret2: ', ret2);\n<\/code><\/pre>\n
        2.2\u3001set(target, proKey, value, receiver)<\/h3>\n
        \u62e6\u622a\u5bf9\u8c61\u5c5e\u6027\u7684\u8bbe\u7f6e\uff0c\u6bd4\u5982proxy.foo = v<\/code> \u6216proxy['foo'] = v<\/code>\uff0c\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c<\/p>\n
          \n
        • \u8d4b\u503c\u6821\u9a8c<\/li>\n<\/ul>\n
          let proxy = new Proxy({}, {\n    set:function(target, propKey, value) {\n        \/\/ \u5927\u4e8e100\u7684\u90fd\u8d4b\u503c\u4e3a100\n        if (value > 100) {\n            value = 100;\n        }\n        target[propKey] = value;\n        return true;\n    }\n})\n\nlet person = Object.create(proxy);\nperson.age = 120;\nconsole.log('person.age: ', person.age)\n\n<\/code><\/pre>\n
          2.3\u3001has(target, propKey)<\/h3>\n
          \u62e6\u622apropKey in proxy<\/code>\u64cd\u4f5c\uff0c\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c<\/p>\n
            \n
          • \u8c03\u7528\u4ee3\u7406\u65f6\u89e6\u53d1\u8be5\u65b9\u6cd5<\/li>\n<\/ul>\n
            let handler = {\n    has(target, key) {\n        if (key[0] === '_') {\n            return false;\n        }\n        return key in target;\n    }\n}\n\nlet target = {\n    _prop : 'xxx',\n    prop : 'zzz'\n}\n\nlet proxy = new Proxy(target, handler);\n\nconsole.log('prop' in proxy) \/\/ true\nconsole.log('_prop' in proxy) \/\/ false\n<\/code><\/pre>\n
              \n
            • \u6ce8\u610f\uff1a\u5982\u679c\u662f\u901a\u8fc7\u7ee7\u627f\u7684\u65b9\u5f0f\u5b9e\u73b0\u7684\u4ee3\u7406\uff0c\u8be5\u65b9\u6cd5\u4e0d\u4f1a\u88ab\u8c03\u7528<\/li>\n<\/ul>\n
              let handler = {\n    has(target, key) {\n        if (key[0] === '_') {\n            return false;\n        }\n        return key in target;\n    }\n}\n\nlet target = {\n    _prop : 'xxx',\n    prop : 'zzz'\n}\n\nObject.setPrototypeOf(target, new Proxy({}, handler));\n\nconsole.log('prop' in target) \/\/ true\nconsole.log('_prop' in target) \/\/ true\n<\/code><\/pre>\n
                \n
              • \u8be5\u65b9\u6cd5\u5bf9for...in<\/code>\u5faa\u73af\u4e0d\u751f\u6548<\/li>\n<\/ul>\n
                let handler = {\n    has(target, key) {\n        if (key[0] === '_') {\n            return false;\n        }\n        return key in target;\n    }\n}\n\nlet target = {\n    _prop : 'xxx',\n    prop : 'zzz'\n}\n\nlet proxy = new Proxy(target, handler);\n\nfor(let key in target) {\n    \/\/ \u4e24\u4e2a\u5c5e\u6027\u5747\u4f1a\u8f93\u51fa\n    console.log('key: ', key)\n}\n<\/code><\/pre>\n
                2.4\u3001deleteProperty(target, propKey)<\/h3>\n
                \u62e6\u622adelete proxy[propKey]<\/code>\u7684\u64cd\u4f5c\uff0c\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c<\/p>\n
                let handler = {\n    deleteProperty(target, key){\n        console.log('deleteProperty');\n        return Reflect.deleteProperty(target, key);\n    }\n}\nlet person = {\n    age: 12\n}\n\nlet proxy = new Proxy(person, handler);\n\n\nconsole.log('person: ', person); \/\/ person:  {age: 12}\ndelete proxy.age; \/\/ deleteProperty\nconsole.log('person: ', person); \/\/ person:  {}\n<\/code><\/pre>\n
                2.5\u3001ownKeys(target)<\/h3>\n
                \u62e6\u622aObject.getOwnPropertyNames(proxy)<\/code>\u3001Object.getOwnPropertySymbols(proxy)<\/code>\u3001Object.keys(proxy)<\/code>\u3001for...in<\/code>\u5faa\u73af\uff0c\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\u3002\u8be5\u65b9\u6cd5\u8fd4\u56de\u76ee\u6807\u5bf9\u8c61\u6240\u6709\u81ea\u8eab\u7684\u5c5e\u6027\u7684\u5c5e\u6027\u540d\uff0c\u800cObject.keys()<\/code>\u7684\u8fd4\u56de\u7ed3\u679c\u4ec5\u5305\u62ec\u76ee\u6807\u5bf9\u8c61\u81ea\u8eab\u7684\u53ef\u904d\u5386\u5c5e\u6027<\/p>\n
                let handler = {\n    ownKeys(target) {\n        console.log('ownKeys');\n        return Reflect.ownKeys(target);\n    }\n}\n\nlet person = {\n    name: 'xxx',\n    age: 18\n}\n\nlet proxy = new Proxy(person, handler);\n\n\/\/ Object.keys\nObject.keys(proxy);\n\/\/ for...in\nfor(let key in proxy) {\n    console.log('key: ', key)\n}\n\/\/ getOwnPropertyNames()\nObject.getOwnPropertyNames(proxy)\n\/\/ getOwnPropertySymbols()\nObject.getOwnPropertySymbols(proxy);\n<\/code><\/pre>\n
                  \n
                • for...in<\/code>\u4e2d\u5982\u679c\u8fd4\u56de\u7684\u6570\u7ec4\u4e2d\u4e0d\u5305\u542b\u539f\u5bf9\u8c61\u7684\u5c5e\u6027\uff0c\u5219\u4e0d\u4f1a\u904d\u5386\u51fa\u503c<\/li>\n<\/ul>\n
                  let handler = {\n    ownKeys(target) {\n        console.log('ownKeys');\n        \/\/ \u6570\u7ec4\u4e2d\u5fc5\u987b\u662f\u5b57\u7b26\u4e32\u6216Symbol\u5426\u5219\u4f1a\u62a5\u9519\n        return ['a', 'b'];\n    }\n}\n\nlet person = {\n    name: 'xxx',\n    age: 12\n}\n\nlet proxy = new Proxy(person, handler);\n\n\/\/ \u4e0d\u4f1a\u6709\u8f93\u51fa\nfor(let key in proxy) {\n    console.log('key: ', key);\n}\n<\/code><\/pre>\n
                  2.6\u3001getOwnPropertyDescriptor(target, propKey)<\/h3>\n
                  \u62e6\u622aObject.getOwnPropertyDescriptor(proxy, propKey)<\/code>\uff0c\u8fd4\u56de\u5c5e\u6027\u7684\u63cf\u8ff0\u5bf9\u8c61<\/p>\n
                    \n
                  • \u5f53\u524d\u5bf9\u8c61\u81ea\u5df1\u5c5e\u6027\u7684\u63cf\u8ff0<\/li>\n<\/ul>\n
                    let handler = {\n    getOwnPropertyDescriptor(target, key) {\n        console.log('getOwnPropertyDescriptor...');\n        return Reflect.getOwnPropertyDescriptor(target, key);\n    }\n}\nlet person = {\n    age: 12\n}\n\nlet proxy = new Proxy(person, handler);\n\nlet age = Object.getOwnPropertyDescriptor(proxy, 'age');\nlet name = Object.getOwnPropertyDescriptor(proxy, 'name');\nconsole.log('age: ', age); \/\/ {value: 12, writable: true, enumerable: true, configurable: true}\nconsole.log('name: ', name); \/\/ undefined\n<\/code><\/pre>\n
                    2.7\u3001defineProperty(target, propKey, propDesc)<\/h3>\n
                    \u62e6\u622aObject.defineProperty(proxy, propKey, propDesc)<\/code>\u3001Object.defineProperties(proxy, propDescs)<\/code>\uff0c\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c<\/p>\n
                    let handler = {\n    defineProperty(target, key, descriptor) {\n        console.log('defineProperty')\n        return Reflect.defineProperty(target, key, descriptor);\n    }\n}\n\nlet person = {\n    age: 10\n}\n\nlet proxy = new Proxy(person, handler);\n\n\/\/ \u4e24\u79cd\u65b9\u5f0f\u589e\u52a0\u5c5e\u6027\u90fd\u4f1a\u89e6\u53d1\nproxy.height = 180;\nObject.defineProperty(proxy, 'weight', {\n    value: 70\n});\n\nconsole.log('person: ', person)\n<\/code><\/pre>\n
                    2.8\u3001preventExtensions(target)<\/h3>\n
                    \u62e6\u622aObject.preventExtensions(proxy)<\/code>\uff0c\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c<\/p>\n
                    let handler = {\n    preventExtensions(target) {\n        console.log('perventExtensions...');\n        return Reflect.preventExtensions(target);\n    }\n}\n\nlet person = {\n    name: 'xxx',\n    age: 13\n}\n\nlet proxy = new Proxy(person, handler);\n\nObject.preventExtensions(proxy);\n<\/code><\/pre>\n
                    2.9\u3001getPrototypeOf(target)<\/h3>\n
                    \u62e6\u622aObject.getPrototypeOf(proxy)\uff0c\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c<\/p>\n
                      \n
                    • Object.prototype.__proto__<\/code><\/li>\n
                    • Object.prototype.isPrototypeOf()<\/code><\/li>\n
                    • Object.getPrototypeOf()<\/code><\/li>\n
                    • Reflect.getPrototypeOf()<\/code><\/li>\n
                    • instanceof<\/code><\/li>\n<\/ul>\n
                      let handler = {\n    getPrototypeOf(target) {\n        console.log('getPrototypeOf....');\n        return Reflect.getPrototypeOf(target);\n    }\n}\n\nlet target = {\n    name: 'xxx'\n}\n\nlet proxy = new Proxy(target, handler);\n\n\/\/ \u4ee5\u4e0b4\u53e5\u4ee3\u7801\u90fd\u4f1a\u89e6\u53d1handler\u4e2d\u7684getPrototypeOf\u65b9\u6cd5\nObject.getPrototypeOf(proxy)\nReflect.getPrototypeOf(proxy)\nproxy instanceof Object\n\/\/ Object.prototype\u662f\u5426\u662fproxy\u7684\u539f\u578b\nObject.prototype.isPrototypeOf(proxy)\n<\/code><\/pre>\n
                      2.10\u3001isExtensible(target)<\/h3>\n
                      \u62e6\u622aObject.isExtensible(proxy)\uff0c\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c<\/p>\n
                      let handler = {\n    isExtensible(target) {\n        console.log('isExtensible...');\n        \/\/ \u8fd9\u91cc\u5982\u679c\u8fd4\u56de\u548c\u539f\u5bf9\u8c61\u7684\u7ed3\u679c\u4e0d\u4e00\u81f4\u4f1a\u62a5\u9519\n        \/\/ \u5982\u679cObject.preventExtensions(target),\u5219\u5fc5\u987b\u8fd4\u56defalse,\u5426\u5219\u5fc5\u987b\u8fd4\u56detrue\n        return Reflect.isExtensible(target);\n    }\n}\n\nlet person = {\n    name: 'xxx'\n}\n\/\/ \u7981\u6b62\u6269\u5c55\nObject.preventExtensions(person)\n\nlet proxy = new Proxy(person, handler);\n\nlet ret = Object.isExtensible(proxy);\nconsole.log('ret: ', ret) \/\/ false\n<\/code><\/pre>\n
                      2.11\u3001setPrototypeOf(target, proto)<\/h3>\n
                      \u62e6\u622aObject.setPrototypeOf(proxy, proto)<\/code>\uff0c\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\u3002\u5982\u679c\u76ee\u6807\u5bf9\u8c61\u662f\u51fd\u6570\uff0c\u90a3\u4e48\u8fd8\u6709\u4e24\u79cd\u989d\u5916\u64cd\u4f5c\u53ef\u4ee5\u62e6\u622a<\/p>\n
                      let handler = {\n    setPrototypeOf(target, proto) {\n        console.log('setPrototypeOf', proto)\n        \/\/ \u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\n        return true;\n    }\n}\n\nlet person = {\n    name: 'xxx',\n    age: 13\n}\n\nlet proxy = new Proxy(person, handler);\n\nObject.setPrototypeOf(proxy, new Function())\n<\/code><\/pre>\n
                      2.12\u3001apply(target, object, args)<\/h3>\n
                      \u62e6\u622aProxy\u5b9e\u4f8b\u4f5c\u4e3a\u51fd\u6570\u8c03\u7528\u7684\u64cd\u4f5c\uff0c\u6bd4\u5982proxy(...args)<\/code>\u3001proxy.call(object, ...args)<\/code>\u3001proxy.apple(...)<\/code><\/p>\n
                        \n
                      • \u8be5\u65b9\u6cd5\u4f5c\u7528\u7684\u662f\u51fd\u6570\uff0c\u5373Proxy()\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u51fd\u6570<\/li>\n<\/ul>\n
                        let handler = {\n    apply(target, ctx, args) {\n        return Reflect.apply(target, ctx, args) * 2;\n    }\n}\n\nfunction sum(a, b) {\n    return a + b;\n}\n\nlet proxy = new Proxy(sum, handler);\nconsole.log(proxy(1, 2)); \/\/ 6\nconsole.log(proxy.call(null, 1, 2)); \/\/ 6\nconsole.log(proxy.apply(null, [1, 2])); \/\/ 6\nconsole.log(Reflect.apply(proxy, null, [1, 2])); \/\/ 6\n<\/code><\/pre>\n
                        2.13\u3001construct(target, args, newTarget)<\/h3>\n
                        \u62e6\u622aProxy\u5b9e\u4f8b\u4f5c\u4e3a\u6784\u9020\u51fd\u6570\u8c03\u7528\u7684\u64cd\u4f5c\uff0c\u6bd4\u5982new Proxy(...args)<\/code>\uff0c target:\u76ee\u5f55\u5bf9\u8c61<\/p>\n
                        let handler = {\n    construct(target, args, newTarget){\n        console.log('target: ', target, 'args: ', args, 'newTarget: ', newTarget);\n        return Reflect.construct(target, args, newTarget);\n    }\n}\n\nfunction Target(age) {\n    this.age = age;\n}\n\nlet Person = new Proxy(Target, handler);\n\nlet p = new Person(1);\nconsole.log('p: ', p)\/\/ Target {age: 1}\n<\/code><\/pre>\n
                        3\u3001\u5176\u4ed6\u7279\u6027<\/h2>\n
                        3.1\u3001revocable\u65b9\u6cd5<\/h3>\n
                        Proxy<\/code>\u7684\u9759\u6001\u65b9\u6cd5revocable<\/code>\u8fd4\u56deproxy<\/code>\u5bf9\u8c61\u4e0erevoca<\/code>\u51fd\u6570<\/p>\n
                        let handler = {\n    get:function(target, propKey, receiver) {\n        return 'xxx';\n    }\n}\n\nlet person = {\n    name: 'name'\n}\n\nlet {proxy, revoca} = Proxy.revocable(person, handler);\n\nconsole.log('proxy.name: ', proxy.name)\n\nrevoca();\n\/\/ \u518d\u6b21\u8bbf\u95ee\u62a5\u9519\nconsole.log('proxy.name: ', proxy.name)\n<\/code><\/pre>\n
                        3.2\u3001this\u6307\u9488<\/h3>\n
                          \n
                        • target\u5185\u90e8\uff0c\u4e00\u822c\u60c5\u51b5\u4e0bthis\u6307\u5411\u7684\u662f\u8c03\u7528\u8005\uff0c\u5373target\u8c03\u7528\u5219\u6307\u5411target\uff0cproxy\u8c03\u7528\u5219\u6307\u5411proxy<\/li>\n<\/ul>\n
                          let target = {\n    test() {\n        console.log(this === target)\n    }\n}\nlet proxy = new Proxy(target, {});\n\ntarget.test(); \/\/ true\nproxy.test();  \/\/ false\n<\/code><\/pre>\n
                            \n
                          • handler\u5185\u65b9\u6cd5\u4e2dthis\u6307\u5411\u7684\u662fhandler\u5bf9\u8c61<\/li>\n<\/ul>\n
                            let handler = {\n    get(target, propKey, receiver) {\n        console.log(this == handler);\n    }\n}\n\nlet proxy = new Proxy({}, handler);\n\nproxy.foo; \/\/ \u89e6\u53d1get\u65b9\u6cd5\uff0c\u63a7\u5236\u53f0\u8f93\u51fatrue\n<\/code><\/pre>\n
                              \n
                            • \u6709\u4e9b\u539f\u751f\u5bf9\u8c61\u7684\u5185\u90e8\u5c5e\u6027\u53ea\u6709this\u6307\u9488\u624d\u80fd\u8bbf\u95ee\uff0c\u4ece\u800cproxy\u65e0\u6cd5\u4ee3\u7406<\/li>\n<\/ul>\n
                              let date = new Date('2021-01-01');\nconsole.log(date.getDate()); \/\/ 1\n\nlet proxy = new Proxy(date, {})\nconsole.log(proxy.getDate()) \/\/ Uncaught TypeError: this is not a Date object.\n\n\/\/ \u53ef\u4ee5\u901a\u8fc7this\u7ed1\u5b9a\u539f\u751f\u5bf9\u8c61\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\nlet date = new Date('2021-01-01');\nlet proxy = new Proxy(date, {\n    get(target, propKey, receiver) {\n        if (propKey === 'getDate') {\n            \/\/ \u7ed1\u5b9athis\u4e3a\u539f\u59cb\u5bf9\u8c61\n            return target[propKey].bind(target);\n        }\n        return Reflect.get(target, propKey, receiver);\n    }\n})\nconsole.log(proxy.getDate()) \/\/ 1\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
                              1\u3001\u521d\u59cb\u5316\u7684\u51e0\u79cd\u65b9\u5f0f 1.1\u3001Proxy\u5173\u8054\u539f\u59cb\u5bf9\u8c61 let obj = { name: ‘sian’ } \/** * new Proxy(target, handler); * \u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u539f\u59cb\u5bf9\u8c61 * \u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u62e6\u622a\u884c\u4e3a *\/ let proxy = new Proxy(obj, { get: function(target, prop) { return ‘xxx’ } }); object.name \/\/ sian proxy.name \/\/ xxx 1.2\u3001\u901a\u8fc7\u7ee7\u627f\u7684\u65b9\u5f0f\u5b9e\u73b0\u4ee3\u7406 \u5373\uff1aProxy\u505a\u4e3a\u5176\u4ed6\u5bf9\u8c61\u7684\u539f\u578b\u5bf9\u8c61 let proxy = new Proxy({}, { get: function(target, prop) { return ‘xxx’ } }) […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[230,352,365],"class_list":["post-2027","post","type-post","status-publish","format-standard","hentry","category-javascript","tag-es6","tag-proxy","tag-reflect"],"_links":{"self":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/2027","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/comments?post=2027"}],"version-history":[{"count":0,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/2027\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/media?parent=2027"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/categories?post=2027"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/tags?post=2027"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}