//插入html代码
const html = {
	document: false,
	init: function(doc) {
		this.document = doc.$refs.initHtml.$el;
	},
	insert: function(html) {
		var self = this;
		var div = document.createElement('div');
		div.innerHTML = html;
		this.document.appendChild(div);
		var scripts = div.querySelectorAll('script');
		return Array.prototype.slice.apply(scripts).reduce((chain, script) => {
			return chain.then(() => self.runScript(script));
		}, Promise.resolve());
	},
	//执行script代码
	runScript: function(script) {
		return new Promise((reslove, rejected) => {
			const newScript = document.createElement('script');
			newScript.innerHTML = script.innerHTML;
			const src = script.getAttribute('src');
			if (src) newScript.setAttribute('src', src);
			// script 加载完成和错误处理
			newScript.onload = () => reslove();
			newScript.onerror = err => rejected();
			document.head.appendChild(newScript);
			document.head.removeChild(newScript);
			if (!src) {
				// 如果是 inline script 执行是同步的
				reslove();
			}
		})
	},
}
export default html;