objectObserve:根据Polycommise-js库来填充Object.observe（）

对象观察 基于 Observation 库的Object.observe polyfill 例子 // A user model var user = { id: 0, name: 'Romeo Kenfack Tsakem', title: 'Mr.' }; // Create a greeting for the user function updateGreeting() { user.greeting = 'Hello, ' + user.title + ' ' + user.name + '!'; } updateGreeting(); Object.observe(user, function(changes) { changes.forEach(function(change) { // Any time name or title change,