knockout.js - ko.computed 不会在实例化时触发函数

Question

嗨，有没有办法在实例化 ko.computed 时不触发函数

例子是

我有这个 ko.computed

ko.computed(function(){ alert(this.Test); } , this);

所以基本上，如果我实例化这个计算结果，这将触发那里定义的函数 有没有办法在实例化时不触发它？并且仅在依赖项发生变化时才触发它？

Answer 1

您需要设置 deferEvaluation option :

deferEvaluation — Optional. If this option is true, then the value of the computed observable will not be evaluated until something actually attempts to access its value or manually subscribes to it. By default, a computed observable has its value determined immediately during creation.

ko.computed(function(){ alert(this.Test); } , this, { deferEvaluation: true });