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jquery ajax JQuery中实现Ajax与服务器通过json交互数据 
$.ajax({ //一个Ajax过程 
	type: "post", //以post方式与后台沟通 
	url : "get_location_by_id", //与此页面沟通 
	data: 'device_id=' + this.nextSibling.id, 
	beforeSend: function(){
		var win = $.messager.progress({
                title:'Please waiting',
                msg:'Loading data...'
            });
	},
	complete: function(){
		//AJAX请求完成时隐藏loading提示
		$(document).ready(function(){$.messager.progress('close');});
	},
	success : function(msg) {
		//更新数据
		if (msg != "") {
			var total = eval(msg);
			if(total.length == 0){
				change_map_default();
				$.messager.show({
	                title:'友情提示：',
	                msg:'不好意思，你的这个设备还没有地理位置的记录。',
	                timeout:5000,
	                showType:'slide'
	            });
			}
			for ( var index = 0; index < total.length; index++) {
				if (index == 0) {
					change_map(total[index].longitude, total[index].latitude);
				} else {
					addPolyline(total[index - 1].longitude, total[index - 1].latitude,
							total[index].longitude, total[index].latitude);
				}
				var myCompOverlay = new ComplexCustomOverlay(
						new BMap.Point(total[index].longitude, total[index].latitude),
						total[index].time, "地点为：（" + total[index].longitude + "，" + total[index].latitude + "）");
				mp.addOverlay(myCompOverlay);
				add_marker(total[index].longitude, total[index].latitude);
			}
		}
	}
});
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