JSONP 通用函数封装

function jsonp({url, params, callback}) {
      return new Promise((resolve, reject) => {
        let script = document.createElement('script')
        // callback 让服务器端调用,并且将数据传递进来
        window[callback] = function (data) {
          resolve(data)
          document.body.removeChild(script)
        }
        params = {...params, callback}
        const arr = []
        for (let key in params) {
          arr.push(`${key}=${params[key]}`)
        }
        script.src = `${url}?${arr.join('&')}`
        document.body.appendChild(script)
      })
    }

    function synchronize(urls) {
      return urls.map((url,i) => jsonp({url, params: {}, callback: 'show' + i}))
    }

      const ajurl = [
        'http://api.douban.com/v2/movie/in_theaters', 
        'http://api.douban.com/v2/movie/top250'
      ]

      Promise.all(synchronize(ajurl))
        .then(result => {
          for (let val of result) {
            console.log(val)
          }
        })

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