vue开发时，跨域问题解决方法

问题：vue开发时，跨域问题解决方法

解决：做个代理转发即可

具体步骤：

1.vue环境 config下index.js文件  如下标红的设置转发代码

/api:，每个前端访问，自动加上/api

target:用来转发，后端访问地址，端口。

pathRewrite： 重写了访问url，即前端访问url中带/api/xxx，请求到后端，自动把这个/api去掉，否则后端访问不到。

// see http://vuejs-templates.github.io/webpack for documentation.
var path = require('path')

module.exports = {
  build: {
    env: require('./prod.env'),
    index: path.resolve(__dirname, '../dist/index.html'),
    assetsRoot: path.resolve(__dirname, '../dist'),
    assetsSubDirectory: 'static',
    assetsPublicPath: '/',
    productionSourceMap: true,
    // Gzip off by default as many popular static hosts such as
    // Surge or Netlify already gzip all static assets for you.
    // Before setting to `true`, make sure to:
    // npm install --save-dev compression-webpack-plugin
    productionGzip: false,
    productionGzipExtensions: ['js', 'css'],
    // Run the build command with an extra argument to
    // View the bundle analyzer report after build finishes:
    // `npm run build --report`
    // Set to `true` or `false` to always turn it on or off
    bundleAnalyzerReport: process.env.npm_config_report
  },
  dev: {
    env: require('./dev.env'),
    port: 8080,
    autoOpenBrowser: true,
    assetsSubDirectory: 'static',
    assetsPublicPath: '/',
    proxyTable: {
      '/api': {
        target: 'http://127.0.0.1:5000/',  //目标接口域名
        changeOrigin: true,  //是否跨域
        pathRewrite: {
          '^/api': ''   //重写接口
        }
      }
    },
    // 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
  },
  configureWebpack: {
  }
}

以上设置好之后，npm run dev启动时，自动会启动这个转发代理。很好的解决了跨域问题。