自己后台，通用跨域请求数据

function addScriptTag(src) {
  var script = document.createElement('script');
  script.setAttribute("type","text/javascript");
  script.src = src;
  document.body.appendChild(script);
}
function callback(data) {
  console.log('response data: ' + JSON.stringify(data));
}; 

addScriptTag('http://xx/api/v1/Product/GetProduct?key=7&ProductId=f6863a11-612d-4bb0-9bbb-f0ae262be8c3')




//PS:后端返回格式 return "callback("+jsonStr+")"