homework 11

.gitignore

@@ -1,5 +1,2 @@
 node_modules
-package-lock.json
-vnodeBack.js
-vnodeBack2.js
-vnodeBack3.js
+package-lock.json

vdom/vnodeBack.js

@@ -0,0 +1,58 @@
+/*
+简单实现incremental-dom中的关键api, 需要考虑同时存在多个vdom的情况。不考虑element的情况，直接转换为jsonDom
+返回结果示例
+{"tagName":"div","children":[{"tagName":"p","text":"1"}],"text":"2"}
+*/
+
+var currentInfo = {
+	currentNode: null,
+	currentParent: null
+}
+function elementOpen(tagName) {
+	// TODO
+	const tempNode = {
+		tagName: tagName,
+	};
+
+	currentInfo.currentNode = tempNode;
+
+	currentInfo.currentNode.parent = currentInfo.currentParent;
+
+	if (currentInfo.currentNode.parent !== null) {
+		if (Array.isArray(currentInfo.currentNode.parent.children)) {
+			currentInfo.currentNode.parent.children.push(currentInfo.currentNode);
+		} else {
+			currentInfo.currentNode.parent.children = [currentInfo.currentNode];
+		}
+	}
+
+	currentInfo.currentParent = currentInfo.currentNode;
+}
+
+function text(textContent) {
+	// TODO
+	if (currentInfo.currentNode !== null) {
+		currentInfo.currentNode.text = textContent;
+	}
+}
+
+function elementEnd(tagName) {
+	// TODO
+	if (currentInfo.currentNode.tagName === tagName) {
+		const parent = currentInfo.currentNode.parent;
+
+		delete currentInfo.currentNode.parent;
+
+		if (parent !== null) {
+			currentInfo.currentNode = parent;
+		}
+
+		currentInfo.currentParent = parent;
+	}
+}
+module.exports = {
+	elementOpen,
+	text,
+	elementEnd,
+	currentInfo
+};