es6 AJAX封装_es6 封装ajax请求

class Ajax {
	constructor(xhr) {
		xhr = window.XMLHttpRequest ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
		this.xhr = xhr;
	}
	send(options) {
		let xhr = this.xhr;
		let ajax = {
			type: options.type || 'GET',
			url: options.url || '',
			async: options.async || 'true',
			dataType: options.dataType || 'json',
			data: options.data || ''
		};
		return new Promise((resolve, reject) => {
			let dataList = [];
			for (let key in ajax.data) {
				dataList.push(key + '=' + ajax.data[key])
			}
			let dataStr = dataList.join("&");
 
			if (ajax.type === "get" || ajax.type === "GET") {
				console.log(dataStr);
 
				ajax.url = dataStr ? ajax.url + "?" + dataStr : ajax.url;
				console.log(ajax.url);
				xhr.open(ajax.type, ajax.url, ajax.async);
				xhr.send();
			}
			if (ajax.type === "post" || ajax.type === "POST") {
				xhr.open(ajax.type, ajax.url, ajax.async);
				xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
				if (ajax.data) {
					xhr.send(ajax.data);
				} else {
					xhr.send();
				}
			}
 
			xhr.onreadystatechange = () => {
				if (xhr.readyState === 4) {
					if (xhr.status >= 200 && xhr.status < 400) {
						const data = JSON.parse(xhr.response);
						resolve(data);
						console.log(data);
					} else if (xhr.status >= 400) {
						const data = JSON.parse(xhr.response);
						console.log(data);
 
						reject(new Error(xhr.status || 'Server if sail'));
					}
				}
			}
 
		})
 
	}
}