現(xiàn)在在用react-router做一個(gè)SPA應(yīng)用，也存在跨域問(wèn)題，但是我在網(wǎng)上看見(jiàn)別人有的web頁(yè)面可以請(qǐng)求到，是不是別人自己用服務(wù)器做處理了？項(xiàng)目地址fetch(getLatestNews(),{          method: 'GET',          mode: 'cors',      })      .then((response) => {          console.log(response)        if (response.ok) {          return response.json()        }      })      .then((responseData) => {                  this.setState({          isLoaded: true,        })      })      .catch(() => {        this.setState({          isLoaded: false,        })      });警告Fetch API cannot load http://news-at.zhihu.com/api/... No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://www.xboxyan.com' is therefore not allowed access. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.