廢話不多說，直接上程式碼。

	/*利用promise封裝的ajax函式*/
	function ajax(method,url, data){
		 /*相容IE*/	
		 var request;					 
		if(window.XMLHttpRequest){
			 request =new XMLHttpRequest();
		}else{
			 request=new ActiveXObject("Microsoft.XMLHTTP")
		}				
		return new Promise(function(resolve,reject){
				request.onreadystatechange=function(){
						if(request.readyState===4){
							 if(request.status===200){
									resolve(JSON.parse(request.response));
							  }else{
								 reject(request.status);
							  }
						}
				};
				if(method.toUpperCase()=== "GET"){
					var arr = [];
					for(var key in data){
						arr.push(key + '=' + data[key]);
					}
					var getData=arr.join("&");
					
					request.open("GET",url +"?"+getData,true);
					request.send(null);
				}else if(method.toUpperCase()=== "POST"){
					request.open("POST",url,true);
					request.responseType="json";
					request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded;charset=utf-8');
					request.send(data);
				}
				
		});
		
	};
	/*使用方法*/
	var obj={
	access_token:'3452d32463e1b36ad94ee56931ea3cf0',
	pageNumber:1,
	pageSize:20
	}
	var url='https://denterpriseapi.coolcollege.cn/course/queryCourseByPage'
	//開始呼叫介面
	ajax('get',url,obj).then(function(data){
		console.log(data)
	}).catch(function(err){
		console.log(err)
	})