From aa77e9e63b6161fc641b697f250a201ab3136e7c Mon Sep 17 00:00:00 2001 From: DJCai <2230968394@qq.com> Date: Fri, 9 Aug 2019 08:19:02 +0800 Subject: [PATCH] =?UTF-8?q?=E5=AE=8C=E6=88=90=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- package-lock.json | 1024 +++++++++++++++++++++++++++++++++++++++++++++ test/test.js | 12 +- 2 files changed, 1032 insertions(+), 4 deletions(-) create mode 100644 package-lock.json diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..b0e2d8c --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1024 @@ +{ + "name": "exercise4", + "version": "0.0.1", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "ansi-colors": { + "version": "3.2.3", + "resolved": "https://registry.npm.taobao.org/ansi-colors/download/ansi-colors-3.2.3.tgz", + "integrity": "sha1-V9NbhoboUeLMBMQD8cACA5dqGBM=", + "dev": true + }, + "ansi-regex": { + "version": "3.0.0", + 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"^2.0.0", + "which-module": "^2.0.0", + "y18n": "^3.2.1 || ^4.0.0", + "yargs-parser": "^11.1.1" + } + }, + "yargs-parser": { + "version": "11.1.1", + "resolved": "https://registry.npm.taobao.org/yargs-parser/download/yargs-parser-11.1.1.tgz?cache=0&other_urls=https%3A%2F%2Fregistry.npm.taobao.org%2Fyargs-parser%2Fdownload%2Fyargs-parser-11.1.1.tgz", + "integrity": "sha1-h5oIZZc7yp9rq1y987HGfsfTvPQ=", + "dev": true, + "requires": { + "camelcase": "^5.0.0", + "decamelize": "^1.2.0" + } + } + } + } + } +} diff --git a/test/test.js b/test/test.js index 63a72e4..3d10d23 100644 --- a/test/test.js +++ b/test/test.js @@ -4,7 +4,8 @@ describe('this', function () { say: function () { setTimeout(() => { // this 是什么？想想为什么？ - this.should.equal(null) + // 箭头函数内的this指向封闭该箭头函数的环境对象, 这里的环境对象为obj + this.should.equal(obj) done() }, 0) } @@ -15,7 +16,8 @@ describe('this', function () { it('global', function () { function test() { // this 是什么？想想为什么？ - this.should.equal(null) + // this指向所在环境的全局作用域 + this.should.equal(global) } test() }) @@ -26,9 +28,10 @@ describe('this', function () { say: function () { function _say() { // this 是什么？想想为什么？ - this.should.equal(null) + this.should.equal(global) } return _say.bind(obj) + // obj还未定义完就立即函数执行时, 此时obj为undefined, bind(undefined) === bind(), 等价于未硬绑定, this指向所在环境的全局作用域 }() } obj.say() @@ -39,9 +42,10 @@ describe('this', function () { obj.say = function () { function _say() { // this 是什么？想想为什么？ - this.should.equal(null) + this.should.equal(obj) } return _say.bind(obj) + // obj已经被定义并赋值, _say被硬绑定到obj }() obj.say() })