StackOverflow 文件 knockout.js 教程 觀測 顯式訂閱 Observables 顯式訂閱 Observables Created: November-22, 2018 var person = { name: ko.observable('John') }; console.log(person.name()); console.log('Update name'); person.name.subscribe(function(newValue) { console.log("Updated value is " + newValue); }); person.name('Jane'); 建立一個可觀察的觀測