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Category Archives: Vue

TypeScript+Vue实例完全教程

功能 轮播 搜索 列表 懒加载 简单动画 loading vue-router.ts vuex.ts vue-class-component使用 vuex-class使用 xxx.d.ts声明文件 基于类的编写方式 mock数据 tsconfig.json webpack配置 vue-typescript-cli 项目地址：https://github.com/SimonZhangITer/vue-typescript-dpapp-demo 完成后的简单例子 基于类的写法加上静态类型检查，简直不能再嗨

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<script lang="ts">
import Vue from "vue";
import Component from "vue-class-component";
import { State } from "vuex-class";
 
@Component
export default class Shops extends Vue {
  @State shops: StoreState.shop[];
  @State searchVal: string;
 
  get shopList(): StoreState.shop[] {
    const shops = this.shops;
    const searchVal = this.searchVal;
    return shops.filter(
      (el: StoreState.shop) => el.shopName.indexOf(searchVal) > -1
    );
  }
}
</script>

  为什么使用TypeScript JavaScript的超集 支持所有原生JavaScript的语法 强类型语言 现在很多主流语言都是强类型的，而这点也一直是JavaScript所被人诟病的地方。使用TypeScript之后，将会在代码调试、重构等步骤节省很多时间。 比如说：函数在返回值的时候可能经过复杂的操作，那我们如果想要知道这个值的结构就需要去仔细阅读这段代码。那如果有了TypeScript之后，直接就可以看到函数的返回值结构，将会非常的方便 强大的IDE支持 现在的主流编辑器如VSCode、WebStorm、Atom、Sublime等都对TypeScript有着非常友好的支持，主要体现在智能提示上，非常的方便 可运行于任何浏览器、计算机、操作系统 强大的编译引擎 迭代更新快 不断更新，提供更加方便友好的Api 微软和Google爸爸 TypeScript是微软开发的语言，而Google的Angular使用的就是TypeScript，所以不用担心会停止维护，至少在近几年内TypeScript都会一门主流开发语言 npm下载量非常高 截止2017.12.17, TypeScript在全球范围内的npm日均下载量在30w左右，这个数字将近是vue下载量的10倍，可见TypeScript还是非常受欢迎的 TypeScript配置 本项目已经配置完毕，这里记录一下当时的踩坑过程 1. Webpack 首先需要安装ts-loader，这是TypeScript为Webpack提供的编译器，类似于babel-loader

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npm i ts-loader -D

  接着在Webpack的module.rules里面添加对ts的支持(我这里的webpack版本是2.x)：

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{
    test: /\.vue$/,
    loader: 'vue-loader',
    options: vueLoaderConfig
},
{
    test: /\.tsx?$/,
    exclude: /node_modules/,
    use: [
      "babel-loader",
      {
        loader: "ts-loader",
        options: { appendTsxSuffixTo: [/\.vue$/] }
      }
    ]
}

  2. tsconfig.json 创建tsconfig.json文件，放在根目录下，和package.json同级 配置内容主要也看个人需求，具体可以去typescript的官网查看，但是有一点需要注意： 在Vue中，你需要引入 strict: true (或者至少 noImplicitThis: true，这是 strict 模式的一部分) 以利用组件方法中 this 的类型检查，否则它会始终被看作 any 类型。 这里列出我的配置，功能在注释中给出

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{
  "include": [
    "src/*",
    "src/**/*"
  ],
  "exclude": [
    "node_modules"
  ],
  "compilerOptions": {
    // types option has been previously configured
    "types": [
      // add node as an option
      "node"
    ],
    // typeRoots option has been previously configured
    "typeRoots": [
      // add path to @types
      "node_modules/@types"
    ],
    // 以严格模式解析
    "strict": true,
    // 在.tsx文件里支持JSX
    "jsx": "preserve",
    // 使用的JSX工厂函数
    "jsxFactory": "h",
    // 允许从没有设置默认导出的模块中默认导入
    "allowSyntheticDefaultImports": true,
    // 启用装饰器
    "experimentalDecorators": true,
    "strictFunctionTypes": false,
    // 允许编译javascript文件
    "allowJs": true,
    // 采用的模块系统
    "module": "esnext",
    // 编译输出目标 ES 版本
    "target": "es5",
    // 如何处理模块
    "moduleResolution": "node",
    // 在表达式和声明上有隐含的any类型时报错
    "noImplicitAny": true,
    "lib": [
      "dom",
      "es5",
      "es6",
      "es7",
      "es2015.promise"
    ],
    "sourceMap": true,
    "pretty": true
  }
}

  3. 修改main.js 把项目主文件main.js修改成main.ts，里面的写法基本不变，但是有一点需要注意： 引入Vue文件的时候需要加上.vue后缀,否则编辑器识别不到 把webpack的entry文件也修改成main.ts 4. vue-shims.d.ts TypeScript并不支持Vue文件，所以需要告诉TypeScript*.vue文件交给vue编辑器来处理。解决方案就是在创建一个vue-shims.d.ts文件，建议放在src目录下再创建一个typings文件夹，把这个声明文件放进去，如：src/typings/vue-shims.d.ts，文件内容： *.d.ts类型文件不需要手动引入，TypeScript会自动加载

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declare module '*.vue' {
  import Vue from 'vue'
  export default Vue
}

  到这里TypeScript在Vue中配置就完成了，可以愉快的撸代码了~ 第三方插件库 现在Vue官方已经明确提出支持TypeScript，并考虑出一个对应的vue-cli，在这之前，Vue开发团队已经开发出了一些插件库来支持TypeScript，这里简单和大家介绍一下。 Vue-Class-Component vue-class-component是官方维护的TypeScript装饰器，写法比较扁平化。Vue对其做到完美兼容，如果你在声明组件时更喜欢基于类的 API，这个库一定不要错过 ps：用了这个装饰器之后写方法不需要额外加逗号，贼嗨~~~

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import Vue from "vue";
import Component from "vue-class-component";
 
@Component
export default class App extends Vue {
  name:string = 'Simon Zhang'
 
  // computed
  get MyName():string {
    return `My name is ${this.name}`
  }
 
  // methods
  sayHello():void {
    alert(`Hello ${this.name}`)
  }
 
  mounted() {
    this.sayHello();
  }
}

[…]

龙生   03 Dec 2021
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解决 Nginx 部署 Vue 项目路由出现 404 的问题

代码如下:

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server {
    listen      80;
    server_name example.com;
 
    location / {
       root /home/example/dist;
       try_files $uri $uri/ @router; # 配置使用路由
       index  index.html index.htm;
    }
    
   # 路由配置信息
   location @router {
     rewrite ^.*$ /index.html last;
   }
}

  from:https://blog.csdn.net/peng2hui1314/article/details/106690852

龙生   05 Nov 2021
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ERROR in xxx.js from UglifyJs

ERROR in xxx.js from UglifyJs 问题 ERROR in app.bundle.js from UglifyJs Unexpected token: name «element», expected: punc «;» [app.bundle.js:106,8] 在用webpack对代码打包的时候报错，在网上找到了类似的答案，还是没有解决我的问题. 能解决大部分问题的链接 https://stackoverflow.com/questions/41254538/error-in-bundle-js-from-uglifyjs http://www.cnblogs.com/aredleave/p/7586911.html https://segmentfault.com/a/1190000011212544 按照以上方法对环境进行重新配置，依然报错！

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ERROR in ./src/index.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Cannot find module '@babel/core' babel-loader@8 requires Babel 7.x (the package '@babel/core').
If you'd like to use Babel 6.x ('babel-core'), you should install 'babel-loader@7'.

报错原因 通过代码报错原因是 babel-loader 版本问题，因为 babel-loader 用的最新的版本，和 UglifyJs 不兼容. 解决方法 通过运行下面代码对babel-loader进行重新安装（低版本）. npm install --save-dev babel-loader@7 通过修改后的package.json配置文件，亲测可以正确打包，无报错现象.

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{
  "name": "kankan",
  "version": "1.0.0",
  "description": "kankan",
  "main": "webpack.config.js",
  "scripts": {
    "start": "webpack-dev-server --open --config webpack.dev.js",
    "build": "webpack --config webpack.prod.js"
  },
  "author": "kankan",
  "license": "ISC",
  "devDependencies": {
    "babel": "^6.23.0",
    "babel-core": "^6.26.3",
    "babel-loader": "^7.1.5",
    "babel-preset-es2015": "^6.24.1",
    "clean-webpack-plugin": "^2.0.1",
    "css-loader": "^2.1.1",
    "express": "^4.16.4",
    "html-webpack-plugin": "^3.2.0",
    "style-loader": "^0.23.1",
    "uglifyjs-webpack-plugin": "^2.1.2",
    "webpack": "^4.30.0",
    "webpack-cli": "^3.3.1",
    "webpack-dev-middleware": "^3.6.2",
    "webpack-dev-server": "^3.3.1",
    "webpack-manifest-plugin": "^2.0.4",
    "webpack-merge": "^4.2.1"
  }
}

  奇卡奇卡 哈哈哈 个人主页：https://kankan.fun   from:https://blog.csdn.net/qq_38025939/article/details/89576282

龙生   27 Oct 2021
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vue报错：Module build failed: TypeError: this.getOptions is not a function

vue-cli构建项目使用sass报错 Module build failed: TypeError: this.getOptions is not a function 出现问题的原因是安装的sass-loader版本过高,选择安装较低版本的sass-loader即可。

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npm install sass-loader@7.3.1 --save-dev

  Module build failed: Error: Node Sass version 6.0.1 is incompatible with ^4.0.0. 出现问题的原因是安装的sass版本过高,选择安装4.0+版本的sass即可。

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npm install node-sass@4.14.1 --save-dev

  from:https://www.cnblogs.com/chenjy1225/p/14930870.html

龙生   25 Oct 2021
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vue vue-style-loader !css-loader错误

最近在学习vue框架，使用webpack打包vue项目，在执行npm run start的时候 出现如下错误： This dependency was not found: * !!vue-style-loader!css-loader?{"minimize":false,"sourceMap":false}!../../node_modules/vue-loader/lib/style-compiler/index?{"vue":true,"id":"data-v-1d57e5ea","scoped":false,"hasInlineConfig":false}!stylus-loader?{"sourceMap":false}!../../node_modules/vue-loader/lib/selector?type=styles&index=0!./a.vue in ./src/components/a.vue To install it, you can run: npm install --save !!vue-style-loader!css-loader?{"minimize":false,"sourceMap":false}!../../node_modules/vue-loader/lib/style-compiler/index?{"vue":true,"id":"data-v-1d57e5ea","scoped":false,"hasInlineConfig":false}!stylus-loader?{"sourceMap":false}!../../node_modules/vue-loader/lib/selector?type=styles&index=0!./a.vu   解决思路： npm install sass-loader --save; npm install node-sass --save; 然后运行npm run start就可以   from:https://www.cnblogs.com/hexiaobao/p/8260858.html

龙生   25 Oct 2021
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vue中加载loading

首先在components文件夹中新建一个loading.vue组件:   1.loading.vue组件内容如下：

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<template>
 
<div class="markbox" v-show="loading" style="background-color: rgba(0, 0, 0, 0.5);">
 
<div class="sun-loading"></div>
 
</div>
 
</template>
 
 
 
<script>
 
export default {
 
name: 'loading',
 
data() {
 
return {
 
loading: false
 
}
 
},
 
created() {
 
var that = this;
 
this.bus.$on('loading', function(data) {
 
that.loading = !!data;
 
})
 
}
 
}
 
</script>

  css代码:

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/*loading开始*/
 
.sun-loading {
 
width: 45px;
 
height: 45px;
 
display: block;
 
animation: sunLoading 1s steps(12, end) infinite;
 
background: transparent 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');
 
background-size: 100%;
 
margin:auto;
 
position:absolute;
 
top: 0;
 
left: 0;
 
bottom: 0;
 
right:0;
 
}
 
/*loading结束*/

   2.app.vue中设置：

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<template>
 
<div id="app">
 
<router-view/>
 
<loading></loading>
 
</div>
 
</template>
 
<script>
 
import loading from '@/components/common/loading'
 
export default {
 
name: 'App',
 
components:{loading}
 
}
 
</script>

  3.在main.js中设置  

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Vue.prototype.bus = new Vue;

  4.在.vue组件中使用

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// 显示loading
 
this.bus.$emit('loading', true);
 
 
 
// 关闭loading
 
this.bus.$emit('loading', false);

  效果如下:   from:https://blog.csdn.net/liangmengbk/article/details/90201596

龙生   27 Sep 2021
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vue中引用vant，附带样式

1、首先 npm install babel-plugin-import 和 npm install vant 2、样式在项目中的  .babelrc 文件下 ["import", {"libraryName": "vant","libraryDirectory": "es","style": true}, "vant"]]  //vant样式引用 3、在main.js中 import { Button } from 'vant'   //引用vant组件库中可用组件 Vue.use(Button )  注册组件即可。 from:https://www.cnblogs.com/1rookie/p/12660684.html

龙生   14 Sep 2021
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Module build failed: error:couldn’t find preset "env" relative to directory

解决办法参考：https://github.com/babel/babel-preset-env/issues/186 即在命令行输入命令安装模块：npm install babel-preset-env   from:https://blog.csdn.net/acoolgiser/article/details/88814071

龙生   30 Aug 2021
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移动端手写签名插件 vue

第一步

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npm install vue-signature

  第二步 main.js

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import vueSignature from "vue-signature"
Vue.use(vueSignature)

  vue

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<template>
    <div id="app">
        <vueSignature
            ref="signature"
            :sigOption="option"
            :w="'800px'"
            :h="'400px'"
            :disabled="disabled"
            :defaultUrl="dataUrl"
        ></vueSignature>
        <vueSignature ref="signature1" :sigOption="option"></vueSignature>
        <button @click="save">Save</button>
        <button @click="clear">Clear</button>
        <button @click="undo">Undo</button>
        <button @click="addWaterMark">addWaterMark</button>
        <button @click="handleDisabled">disabled</button>
    </div>
</template>
<script>
export default {
    name: "app",
    data() {
        return {
            option: {
                penColor: "rgb(0, 0, 0)",
                backgroundColor: "rgb(255,255,255)",
            },
            disabled: false,
            dataUrl:
                "https://avatars2.githubusercontent.com/u/17644818?s=460&v=4",
        };
    },
    methods: {
        save() {
            var _this = this;
            var png = _this.$refs.signature.save();
            var jpeg = _this.$refs.signature.save("image/jpeg");
            var svg = _this.$refs.signature.save("image/svg+xml");
            console.log(png);
            console.log(jpeg);
            console.log(svg);
        },
        clear() {
            var _this = this;
            _this.$refs.signature.clear();
        },
        undo() {
            var _this = this;
            _this.$refs.signature.undo();
        },
        addWaterMark() {
            var _this = this;
            _this.$refs.signature.addWaterMark({
                text: "mark text", // watermark text, > default ''
                font: "20px Arial", // mark font, > default '20px sans-serif'
                style: "all", // fillText and strokeText, 'all'/'stroke'/'fill', > default 'fill
                fillStyle: "red", // fillcolor, > default '#333'
                strokeStyle: "blue", // strokecolor, > default '#333'
                x: 100, // fill positionX, > default 20
                y: 200, // fill positionY, > default 20
                sx: 100, // stroke positionX, > default 40
                sy: 200, // stroke positionY, > default 40
            });
        },
        fromDataURL(url) {
            var _this = this;
            _this.$refs.signature.fromDataURL(
                "data:image/png;base64,iVBORw0K..."
            );
        },
        handleDisabled() {
            var _this = this;
            _this.disabled = !_this.disabled;
        },
    },
};
</script>

  from:https://blog.csdn.net/XLL20001022/article/details/101548655

龙生   30 Aug 2021
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vue项目打包后css背景图路径不对的问题

问题描述： 自己在自学vue做项目的过程中，遇到一个有关背景图片路径的问题，就是css代码中背景图片是根据相对路径来写的，如下图： 当使用npm run dev命令本地访问的时候，背景图片是正常显示的，可使用npm run build命令打包后，访问dist目录下的项目，页面背景图路径就不对了，显示不出背景图。如下两张图对比 图一：使用npm run dev命令访问   图二：使用npm run build命令打包之后，访问dist目录下的文件，出现的问题，背景图片路径变成了http://127.0.0.1:9000/static/css/static/img/login-bg.0271ef1.jpeg，而实际在dist目录下，图片路径是这样的，如下图   解决办法： 解决办法为：只需要在build/utils.js文件中添加如下一行代码即可。

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publicPath:'../../'

添加位置为如下图：   然后重新执行 npm run build 命令，即可成功显示图片   from:https://www.cnblogs.com/libo0125ok/p/9361038.html

龙生   28 Apr 2021
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