一个JSONP的例子

gistfile1.js

function addScriptTag(src) {
    var script = document.createElement('script');
    script.setAttribute("type","text/javascript");
    script.src = src;
    document.body.appendChild(script);
}

function result(data) {
    alert(data.responseData.results[0].unescapedUrl);
}

addScriptTag("http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=manxisuo&callback=result");