该示例的问题在于,通过设置(绑定)属性并立即通过console.log获取值,不会触发任何触发RunLoop并因此同步更改的事件.有两篇关于RunLoop的优秀博客文章：Part 1和Part 2.尽管他们以Sproutcore为目标,但Ember.js的概念大致相同.

有两种方法可以使您的示例正常工作.

通过Ember.run.sync()强制同步

正如文档所述,调用Ember.run.sync()…是一种立即强制应用程序中的所有绑定同步的有用方法.这样就留下了这样的代码,见http://jsfiddle.net/pangratz666/cwR3P/

App = Ember.Application.create({});
App.wife = Ember.Object.create({
  householdIncome: 80000
});
 
App.husband = Ember.Object.create({
  householdIncomeBinding: 'App.wife.householdIncome'
});
 
// force bindings to sync
Ember.run.sync();
 
console.log(App.husband.get('householdIncome')); // 80000
 
// Someone gets raise.
App.husband.set('householdIncome',90000);
 
// force bindings to sync
Ember.run.sync();
 
console.log(App.wife.get('householdIncome')); // 90000​

或者第二个选择是……

在视图中显示值

在视图中显示属性会为您处理所有RunLoop内容,请参阅http://jsfiddle.net/pangratz666/Ub97S/

JavaScript的：

App = Ember.Application.create({});
App.wife = Ember.Object.create({
    householdIncome: 80000
});
 
App.husband = Ember.Object.create({
    householdIncomeBinding: 'App.wife.householdIncome'
});
 
// invoke function in 3000ms
Ember.run.later(function() {
    // someone gets a raise
    App.husband.set('householdIncome',90000);
},3000);​

把手(视图)：

<script type="text/x-handlebars" >
    Wifes income: {{App.wife.householdIncome}}<br/>
    Husbands income: {{App.husband.householdIncome}}
</script>​