• vue-resource 发送json到后端：
  
  Content-Type字段的类型是application/json，就会有options请求。
  
  http://www.ruanyifeng.com/blog/2016/04/cors.html

this.$http.post('xxx', params, {emulateJSON: false, headers: {'Content-Type': 'application/json;charset=utf-8'}})

　　.then(response => {

　　　　console.log(response)

　　})

　　.catch(error => {

　　　　console.log(error)

　　})

• vue-resource 使用示例：

        this.$http

            // 可以设置过期时间为100ms，来模拟超时

            // .get(this.url, { timeout: 100 })

            .get(this.url)

            .then((response) => {

                console.log(response)

                this.status = response.status

                this.statusText = response.statusText

            })

            // 网络错误、url地址错误、请求超时，能被catch捕获

            .catch((error) => {

                console.log(error)

                this.status = error.status

                this.statusText = error.statusText

            })

• If your web server can't handle requests encoded as application/json, you can enable the emulateJSON option. This will send the request as application/x-www-form-urlencoded MIME type, as if from an normal HTML form.

Vue.http.options.emulateJSON = true;