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HTML

              
                
              
            
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CSS

              
                
              
            
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JS

              
                

	ajax({
				url: 'http://music.qq.com/musicbox/shop/v3/data/hit/hit_all.js',
				jsonp: 'jsonpCallback',
				data: {'callback': 'jsonpCallback'},
				success:function(res){
					JsonCallback(json);
				}
			});
		function JsonCallback(json){

			var data = json.songlist;
			for (var i=0;i<data.length;i++) {
				var width = 300;
				var image_id = data[i].albumId;
				var img = document.createElement("img");
				var pic = "http://imgcache.qq.com/music/photo/album_"+width+"/"+image_id%100+"/"+width+"_albumpic_"+image_id+"_0.jpg";
				img.src = pic;
				document.body.appendChild(img);
			}
		}
function ajax(params) {
	params = params || {};
	params.data = params.data || {};
	var json = params.jsonp ? jsonp(params) : json(params);
	// ajax请求
	function json(params) {
		params.type = (params.type || 'GET').toUpperCase();
		params.data = formatParams(params.data);
		var xhr = null;

		// 实例化XMLHttpRequest对象
		if(window.XMLHttpRequest) {
			xhr = new XMLHttpRequest();
		} else {
			// IE6及其以下版本
			xhr = new ActiveXObjcet('Microsoft.XMLHTTP');
		};

		// 监听事件
		xhr.onreadystatechange = function() {
			if(xhr.readyState == 4) {
				var status = xhr.status;
				if(status >= 200 && status < 300) {
					var response = '';
					var type = xhr.getResponseHeader('Content-type');
					if(type.indexOf('xml') !== -1 && xhr.responseXML) {
						response = xhr.responseXML; //Document对象响应
					} else if(type === 'application/json') {
						response = JSON.parse(xhr.responseText); //JSON响应
					} else {
						response = xhr.responseText; //字符串响应
					};
					params.success && params.success(response);
				} else {
					params.error && params.error(status);
				}
			}
		};

		// 连接和传输数据
		if(params.type == 'GET') {
			xhr.open(params.type, params.url + '?' + params.data, true);
			xhr.send(null);
		} else {
			xhr.open(params.type, params.url, true);
			//设置提交时的内容类型
			xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
			xhr.send(params.data);
		}
	}

	// jsonp请求
	function jsonp(params) {
		//创建script标签并加入到页面中
		var callbackName = params.jsonp;
		var head = document.getElementsByTagName('head')[0];
		// 设置传递给后台的回调参数名
		params.data['callback'] = callbackName;
		var data = formatParams(params.data);
		var script = document.createElement('script');
		head.appendChild(script);

		//创建jsonp回调函数
		window[callbackName] = function(json) {
			head.removeChild(script);
			clearTimeout(script.timer);
			window[callbackName] = null;
			params.success && params.success(json);
		};

		//发送请求
		script.src = params.url + '?' + data;

		//超时处理
		if(params.time) {
			script.timer = setTimeout(function() {
				window[callbackName] = null;
				head.removeChild(script);
				params.error && params.error({
					message: '超时'
				});
			}, time);
		}
	};
	//格式化参数
	function formatParams(data) {
		var arr = [];
		for(var name in data) {
			arr.push(encodeURIComponent(name) + '=' + encodeURIComponent(data[name]));
		};
		// 添加一个随机数,防止缓存
		arr.push('v=' + random());
		return arr.join('&');
	}
	// 获取随机数
	function random() {
		return Math.floor(Math.random() * 10000 + 500);
	}
}
              
            
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