perf(wx-react): optimize objectIs

Author: ykforerlang

packages/wx-react/package.json

@@ -10,8 +10,8 @@
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "build": "rollup -c",
-    "pub-beta": "npm publish --tag=beta",
-    "pub": "npm publish"
+    "pub-beta": "npm run build && npm publish --tag=beta",
+    "pub": "npm run build && npm publish"
   },
   "author": "",
   "license": "MIT"

packages/wx-react/src/shallowEqual.js

@@ -8,14 +8,22 @@
 
 const hasOwn = Object.prototype.hasOwnProperty
 
-function is(x, y) {
-    if (x === y) {
-        return x !== 0 || y !== 0 || 1 / x === 1 / y
-    } else {
-        return x !== x && y !== y
+// 参考：https://github.com/facebook/react/pull/16212
+let is
+if (typeof Object.is === 'function') {
+    is = Object.is
+} else {
+    is = (x, y) => {
+        if (x === y) {
+            return x !== 0 || y !== 0 || 1 / x === 1 / y
+        } else {
+            return x !== x && y !== y
+        }
     }
 }
 
+
+
 export default function shallowEqual(objA, objB) {
     if (is(objA, objB)) return true