node/server/www/jsonp.html

<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>jsonp</title>
  <style>
    body {
      text-align: center;
    }
  </style>
</head>
<body>
  <ul id="ct">
    
  </ul>
  <button id="load-news">加载新闻</button> 

  <script>
    // jsonp 利用script标签可以跨域请求资源的特性，将请求放在script标签中，来实现跨域

    var btn = document.querySelector('#load-news')
    var ct = document.querySelector('#ct')    
    
    btn.onclick = function () {
      var js = document.createElement('script')
      // 根据后端接口传递callback
      js.src = 'http://localhost:8080/jsonp?callback=renderPage'
      document.body.appendChild(js)
      document.body.removeChild(js)
    }
    
    // 通过script标签访问不需要解析
    function renderPage(data) {
      var node = ''
      for (var key in data) {
        node += '<li>' + data[key] + '</li>'
      }
      ct.innerHTML = node
    }
  </script>
</body>
</html>