jsonp实现跨域请求

function handleResponse(callback) {
    console.log(callback.books.__proto__);
}
var oButton=document.getElementById('oButton');
oButton.addEventListener('click',function () {
    var script=document.createElement('script');
    script.src="https://api.douban.com/v2/book/search?q=javascript&count=1&callback=handleResponse";
    document.body.appendChild(script);
})