xmlhttprequest MIME和内容未定义错误

Question

$.ajax({
type: 'POST',
url: "http://www.youtube.com",
dataType: 'jsonp',
beforeSend: function( xhr ) {
contentType: "text/html; charset=utf-8",
    xhr.setRequestHeader( "Content-Type", "text/html" ),
    xhr.overrideMimeType( "text/html" )
},
    success: function (data) {
$( "#post-result" ).text(data);
}
});

此代码运行到控制台错误：拒绝执行来自＆＃39; http://www.youtube.com/?callback=jQuery110106930327706504613_1447535859452&_=1447535859453＆＃39;因为它的MIME类型（＆＃39; text / html＆＃39;）不可执行，并且启用了严格的MIME类型检查。