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+# zrender
+
+## 概览
+
+```js
+// 对外暴露一个对象
+var zrender = {
+    version: '4.0.7',
+    init: function (dom, opts) {},
+    dispose: function (zr) {},
+    getInstance: function (id) {},
+    registerPainter: function (name, Ctor) {}
+    // ...... other interface：src/export.js
+};
+```
+
+## 内部类
+
+* ZRender
+
+## 几个重要内部对象(类实例)
+
+* Storage（M）
+* Painter（V）
+* Handler（C）
+* Animation
+
+## src/core
+
+### src/core/arrayDiff.js
+
+> If x and y are strings, where length(x) = n and length(y) = m, the Needleman-Wunsch algorithm finds an optimal alignment in O(nm) time, using O(nm) space. Hirschberg's algorithm is a clever modification of the Needleman-Wunsch Algorithm which still takes O (nm) time, but needs only O(min{n,m}) space and is much faster in practice.