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HTML

              
                <div id="chart"></div>
              
            
!

CSS

              
                
              
            
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JS

              
                const url = "https://gonsakon.github.io/D3-API-SAMPLE/";
console.log(url);

//載入圖表
function load(data) {
	var chart = c3.generate({
		bindto: "#chart",
		data: {
			columns: data
		}
	});
}

//取得資料方法
function getURL(URL) {
	return new Promise(function (resolve) {
		var xhr = new XMLHttpRequest();
		xhr.open("get", url + URL);
		xhr.send(null);
		xhr.onload = function () {
			//回傳一個資料
			resolve(JSON.parse(xhr.responseText));
		};
	});
}

//取得高雄屏東資料
let kaohsiung = getURL("kaohsiung.json");
let pingtung = getURL("pingtung.json");

//promise AJAX 取得資料方式
Promise.all([kaohsiung, pingtung]).then(function (results) {
	var originData = [];
	originData.push(["高雄"].concat(results[0])); //把高雄資料展開後載入圖表
	originData.push(["屏東"].concat(results[1])); //把屏東資料展開後載入圖表
	load(originData); //帶回圖表
});

              
            
!
999px

Console