vue----解决跨域问题

方式1：通过代理来解决

　　一部分代码（vue 2.x）

　　/api/cms：表示url以这个开头的（/api/cms/xx/xx）请求转发到http://localhost:31001/api/cms/xx/xx（有node.js代理服务器请求），pathRewrite:表示将/api替换指定的字符串，请求转发的url变成了 http://localhost:31001/cms/xx/xx；

配置：在 /config/index.js。里面有一个proxyTable，往里面添加相应的东西，注意访问的地址还是本地的，node.js帮我们转发了，我们自己是看不到的；

module.exports = {
  dev: {
    // Paths
    assetsSubDirectory: 'static',
    assetsPublicPath: '/',
    //proxyTable: proxyConfig.proxyList,
    proxyTable: {
      '/banner': {
        //target: 'http://localhost:3000/mock/11'
        target: 'http://127.0.0.1:7777'

      },
      '/api/cms': {
        target: 'http://localhost:31001',
        pathRewrite: {
          '^/api': ''
        }
        //target: 'http://127.0.0.1:50201'

      }
      /*,
      '/ucenter': {
        // target: 'http://localhost:3000/mock/11'
        //target: 'http://127.0.0.1:31200'
        target: 'http://127.0.0.1:50201'

      },
      '/auth': {
        // target: 'http://localhost:3000/mock/11'
        //target: 'http://127.0.0.1:31200'
        target: 'http://127.0.0.1:50201/api'

      },
      '/course': {
        // target: 'http://localhost:3000/mock/11'
        //target: 'http://127.0.0.1:31200'
        target: 'http://127.0.0.1:50201/api'

      },
      '/media': {//媒资管理
        //target: 'http://127.0.0.1:31400'
        target: 'http://127.0.0.1:50201'
      },

      '/cms/!*': {//cms管理
        //target: 'http://127.0.0.1:31001'
        target: 'http://127.0.0.1:50201'

      },


      '/filesystem/!*': {//文件系统管理
        //target: 'http://127.0.0.1:22100'
        target: 'http://127.0.0.1:50201'

      },
      '/category/!*': {//分类管理
        // target: 'http://127.0.0.1:3000/mock/11'
        //target: 'http://127.0.0.1:31200'
        target: 'http://127.0.0.1:50201'

      },
      '/sys/!*': {//系统管理
        //target: 'http://127.0.0.1:31001'
        target: 'http://127.0.0.1:50201'

      },*/
      /*'/static/!*': {//系统管理
        //target: 'http://127.0.0.1:31001'
        target: 'http://127.0.0.1'

      },
      '/group1/*': {//系统管理
        // target: 'http://127.0.0.1:3000/mock/11'
        target: 'http://192.168.101.64'

      }*/
    },
    // Various Dev Server settings
    host: 'localhost', // can be overwritten by process.env.HOST
    port: 11000, // can be overwritten by process.env.PORT, if port is in use, a free one will be determined
    autoOpenBrowser: false,
    errorOverlay: true,
    notifyOnErrors: true,
    poll: false, // https://webpack.js.org/configuration/dev-server/#devserver-watchoptions-

    // Use Eslint Loader?
    // If true, your code will be linted during bundling and
    // linting errors and warnings will be shown in the console.
    useEslint: true,
    // If true, eslint errors and warnings will also be shown in the error overlay
    // in the browser.
    showEslintErrorsInOverlay: false,

    /**
     * Source Maps
     */

    // https://webpack.js.org/configuration/devtool/#development
    devtool: 'eval-source-map',

    // If you have problems debugging vue-files in devtools,
    // set this to false - it *may* help
    // https://vue-loader.vuejs.org/en/options.html#cachebusting
    cacheBusting: true,

    // CSS Sourcemaps off by default because relative paths are "buggy"
    // with this option, according to the CSS-Loader README
    // (https://github.com/webpack/css-loader#sourcemaps)
    // In our experience, they generally work as expected,
    // just be aware of this issue when enabling this option.
    cssSourceMap: false,
  }
}