主题
JavaScript
并发请求
js
const data = reactive({
listContent: [],
listSelection: [],
});
// 获取类型
async function getSurveyTypes() {
showLoadingToast({
message: '加载中...',
forbidClick: true,
});
try {
const types = [0, 1];
const requests = types.map((type) => self_request(`/mztSuggestionDict/get?type=${type}`));
const [res0, res1] = await Promise.all(requests);
data.listContent = res0?.data || [];
data.listSelection = res1?.data || [];
closeToast();
} catch (e) {
console.error(e);
}
}事件循环
执行同步任务（立即执行）
处理异步任务（如定时器、网络请求）
任务队列保存已完成的异步回调
轮询队列，当主线程空闲时按顺序执行回调
javascript
console.log('开始'); // 同步任务 → 立即执行
setTimeout(() => console.log('定时器回调'), 0); // 异步任务 → 宏任务队列
Promise.resolve().then(() => console.log('Promise回调')); // 异步任务 → 微任务队列
console.log('结束'); // 同步任务 → 立即执行
// 输出顺序：
// 开始 → 结束 → Promise回调 → 定时器回调
// 同步任务 -> 微任务 -> 宏任务JSDoc
js
/**
* 处理用户信息
*
* @description
* 这是一个示例函数，用于演示 JSDoc 常用标签的写法，包括参数、返回值、
* 类型定义、示例代码、错误、作者信息、引用、版本、弃用等。
*
* @param {Object} [user={}] - 用户信息对象（可选，默认空对象）
* @param {string} [user.name='匿名'] - 用户姓名（可选，默认“匿名”）
* @param {number} [user.age=18] - 用户年龄（可选，默认 18）
* @param {Array<string>} [user.tags=[]] - 用户标签（可选，默认空数组）
* @param {(string|number)} [id=null] - 用户 ID，可传字符串或数字（可选，默认 null）
* @param {'blue'|'red'} [color='blue'] - 用户颜色主题，只能选择 'blue' 或 'red'（可选，默认 'blue'）
* @param {...string} [roles] - 用户角色，可变参数（可选）
*
* @returns {Promise<Object>} 返回一个 Promise，resolve 用户详情
*
* @throws {TypeError} 当参数格式不正确时抛出
* @deprecated 此方法将在 v2.0 移除，请使用 `fetchUserDetail` 替代
* @author
* 张三 <zhangsan@example.com>
* @version 1.2.3
* @since 1.0.0
* @see {@link https://jsdoc.app/ JSDoc 官方文档}
*
* @example
* // 调用示例：使用默认值
* getUserDetail()
* .then(user => console.log(user)) // 输出默认的匿名用户
*
* // 调用示例：传递完整参数
* getUserDetail({name: '张三', age: 20}, 1001, 'admin', 'editor', 'red')
* .then(user => console.log(user))
* .catch(err => console.error(err))
*/
async function getUserDetail(user = { name: '匿名', age: 18, tags: [] }, id = null, color = 'red', ...roles) {
if (typeof user !== 'object') {
throw new TypeError('参数 user 必须是对象');
}
if (!['blue', 'red'].includes(color)) {
throw new TypeError('color 必须是 "blue" 或 "red"');
}
// 模拟请求
return Promise.resolve({
...user,
id,
roles,
color,
});
}Infinity
安全值，比任何数字都大
ts
const getSupport = async () => {
try {
const v = await getMztAppVersion();
const minVersionMap: Record<string, number> = {
'1': 484,
'2': 133,
'3': 491,
};
// 如果不在 map 中的数字则为false,使用Infinity来进行比对
return Number(v.version) >= (minVersionMap[v.type] || Infinity);
} catch (e) {
return false;
}
};动态插入脚本
脚本放入
public/文件夹下
js
// 第一种
const script = document.createElement('script');
script.src = '/b.js';
script.async = true; // 可选，异步加载
document.head.appendChild(script);
script.onload = () => {
console.log('b.js 加载完成');
};
// 第二种
import('/b.js').then((module) => {
console.log('b.js 加载完成', module);
});Promise
Promise.all
都成功才算成功
js
async function init() {
showLoadingToast({
message: '加载中...',
forbidClick: true,
});
try {
// 两个请求并行，必须都成功
const [questionListRes, dictRes] = await Promise.all([
self_request('mztSuggestionQuestion/get', 'GET', {
questionnaireId: questionnaireId,
}),
self_request('/mztSuggestionDict/get?type=1'),
]);
data.listSelection = dictRes?.data || [];
data.listContent = questionListRes?.data || [];
} catch (e) {
console.error('请求失败:', e);
} finally {
closeToast();
}
}Promise.allSettled
允许其中一个失败，能拿到成功的部分
js
async function init() {
showLoadingToast({
message: '加载中...',
forbidClick: true,
});
try {
const results = await Promise.allSettled([
self_request('mztSuggestionQuestion/get', 'GET', {
questionnaireId: questionnaireId,
}),
self_request('/mztSuggestionDict/get?type=1'),
]);
// 题目数据
if (results[0].status === 'fulfilled') {
data.listContent = results[0].value?.data || [];
} else {
console.error('获取题目失败:', results[0].reason);
}
// 字典数据
if (results[1].status === 'fulfilled') {
data.listSelection = results[1].value?.data || [];
} else {
console.error('获取字典失败:', results[1].reason);
}
} catch (e) {
console.error('未知错误:', e);
} finally {
closeToast();
}
}tsconfig.json
json
{
"compilerOptions": {
/* Visit https://aka.ms/tsconfig.json to read more about this file */
/* Basic Options */
// "incremental": true, /* Enable incremental compilation */
"target": "esnext" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */,
"module": "esnext" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */,
"lib": ["esnext", "dom", "dom.iterable", "scripthost"] /* Specify library files to be included in the compilation. */,
// "allowJs": true, /* Allow javascript files to be compiled. */
// "checkJs": true, /* Report errors in .js files. */
"jsx": "preserve" /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */,
// "declaration": true /* Generates corresponding '.d.ts' file. */,
// "declarationMap": true, /* Generates a sourcemap for each corresponding '.d.ts' file. */
// "sourceMap": true, /* Generates corresponding '.map' file. */
// "outFile": "./", /* Concatenate and emit output to single file. */
// "outDir": "./", /* Redirect output structure to the directory. */
// "rootDir": "./", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
// "composite": true, /* Enable project compilation */
// "tsBuildInfoFile": "./", /* Specify file to store incremental compilation information */
// "removeComments": true, /* Do not emit comments to output. */
// "noEmit": true, /* Do not emit outputs. */
// "importHelpers": true /* Import emit helpers from 'tslib'. */,
// "downlevelIteration": true /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */,
"isolatedModules": true /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */,
/* Strict Type-Checking Options */
"strict": true /* Enable all strict type-checking options. */,
// "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
// "strictNullChecks": true, /* Enable strict null checks. */
// "strictFunctionTypes": true, /* Enable strict checking of function types. */
// "strictBindCallApply": true, /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
// "strictPropertyInitialization": true, /* Enable strict checking of property initialization in classes. */
// "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */
// "alwaysStrict": true, /* Parse in strict mode and emit "use strict" for each source file. */
/* Additional Checks */
// "noUnusedLocals": true, /* Report errors on unused locals. */
// "noUnusedParameters": true, /* Report errors on unused parameters. */
// "noImplicitReturns": true, /* Report error when not all code paths in function return a value. */
// "noFallthroughCasesInSwitch": true, /* Report errors for fallthrough cases in switch statement. */
// "noUncheckedIndexedAccess": true, /* Include 'undefined' in index signature results */
/* Module Resolution Options */
"moduleResolution": "node" /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */,
"baseUrl": "." /* Base directory to resolve non-absolute module names. */,
"paths": {
"/@/*": ["src/*"]
} /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */,
// "rootDirs": [], /* List of root folders whose combined content represents the structure of the project at runtime. */
// "typeRoots": [], /* List of folders to include type definitions from. */
"types": ["vite/client"] /* Type declaration files to be included in compilation. */,
"allowSyntheticDefaultImports": true /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */,
"esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
// "preserveSymlinks": true, /* Do not resolve the real path of symlinks. */
// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
/* Source Map Options */
// "sourceRoot": "", /* Specify the location where debugger should locate TypeScript files instead of source locations. */
// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSourceMap": true, /* Emit a single file with source maps instead of having a separate file. */
// "inlineSources": true, /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
/* Experimental Options */
"experimentalDecorators": true /* Enables experimental support for ES7 decorators. */,
// "emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */
/* Advanced Options */
"skipLibCheck": true /* Skip type checking of declaration files. */,
"forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */
},
"include": ["src/**/*.js", "src/**/*.ts", "src/**/*.vue", "src/**/*.tsx", "src/**/*.d.ts"], // **Represents any directory, and * represents any file. Indicates that all files in the src directory will be compiled
"exclude": ["node_modules", "dist"] // Indicates the file directory that does not need to be compiled
}