VSCode自定义代码片段13——Vue的状态大管家

Posted 2022-10-27 浅香沉木

Vue的状态大管家

	// V'Vuex
	// 13  如何自定义用户代码片段：VSCode =》左下角设置 =》用户代码片段 =》新建全局代码片段文件... =》自定义片段名称 =》编辑用户片段 =》ctrl+S 保存
	// Vue的状态大管家
	"Print to console": 
		"prefix": "V'Vuex",
		"body": [
			"// 位置：./store/index.js",
			"// 1,引入插件",
			"import Vue from \\"vue\\"",
			"import Vuex from \\"vuex\\"",
			"",
			"// 2，安装插件",
			"Vue.use(Vuex);",
			"",
			"// 3，创建对象",
			"const store = new Vuex.Store(",
			"    //【state:状态】------ ----- ---- ---【state:状态】 --- ---- ----- ------ 【state:状态】",
			"    state: //状态",
			"        num: 18",
			"        , students: [",
			"            ",
			"                name: \\"小白\\",",
			"                age: 11",
			"            ",
			"            , ",
			"                name: \\"小黑\\",",
			"                age: 22",
			"            ",
			"            , ",
			"                name: \\"小红\\",",
			"                age: 33",
			"            ",
			"        ]",
			"    ",
			"    //【mutations:改变状态】------ ----- ---- ---【mutations:改变状态】 --- ---- ----- ------ 【mutations:改变状态】",
			"    , mutations: //改变状态的方法，其中的每个方法默认传入state",
			"        // 被所有组件调用唯一方式：this.$store.commit(\\"change_num\\"[,对象参数])",
			"        // 一般要先初始化再使用，但也可以用Vue.set(对象,键,值)方法响应式添加属性，Vue.delete(对象,属性名)响应式删除对象属性",
			"        change_num() ",
			"            state.num++;",
			"        ,",
			"        aUpdateInfo() ",
			"            state.students[0].name = \\"老王\\"",
			"        ",
			"    ",
			"    , actions: //有异步操作的方法，其中的方法默认传入context（上下文，环境，语境）",
			"        // 被所有组件调用唯一方式：this.$store.disqatch(\\"change_num\\"[,对象参数])",
			"        aUpdateInfo(context) ",
			"            // 有时完成异步后可以用Promis回调.then()",
			"            return new Promise((resolve, reject) => ",
			"                setTimeout(() => ",
			"                    context.commit(\\"updateInfo\\")",
			"                , 1000);",
			"            )",
			"        ",
			"    ",
			"    //【getters:计算属性】------ ----- ---- ---【getters:计算属性】 --- ---- ----- ------ 【getters:计算属性】",
			"    , getters: //计算属性，对状态需要处理后的数据",
			"        // 被组件使用：$store.getters.more20stu",
			"        more20stu(state) ",
			"            return state.students.filter(n => n.age > 20);",
			"        ",
			"        , more20stu(state, getters) //第二个参数固定为getters",
			"            return getters.more20stu.length;",
			"        ",
			"        , more20stu(state) ",
			"            return function name(age) //需要其它参数时可返回成一个函数",
			"                return state.students.filter(n => n.age > age);",
			"            ",
			"        ",
			"    ",
			"    //【modules:子管家模块】------ ----- ---- ---【modules:子管家模块】 --- ---- ----- ------ 【modules:子管家模块】",
			"    , modules: //相当于大管家的子管家,子管家有自己的独立作用域,它保存在大管家的state中，",
			"        // 被.vue组件调用小仓库:this.$store.state.mod_a.age",
			"        // 而其它属性同大管家一样调用 this.$store.commit(\\"change_age_2\\"[,对象参数])",
			"        mod_a: ",
			"            state: ",
			"                age: 10",
			"            ",
			"            , mutations: ",
			"                change_age_2() ",
			"                    state.age++;",
			"                ",
			"            ",
			"            , actions: ",
			"            , getters:  // 默认传入context，contxt.rootGetters可访问大管家的getters,同理context.rootState也是",
			"        ,",
			"        mod_b: ",
			"",
			"        ",
			"    ",
			");",
			"",
			"// 最后，导出到main.js然后注册",
			"export default store;",
			"",
			"// 补充：对象的解构",
			"//  const name ,heigth ,age = obj // 定义常量name,heigth,age分别取出对象中对应属性值 ",
		],
		"description": "Vue的状态大管家"
	

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