面试题与答案
了解热门 Knockout JS 面试题与答案，帮助应届生和有经验的候选人为求职面试做好准备。
共 25 道题
面试题与答案
资深 / 专家级别面试题与答案
问题 1
Explain the concept of computed observables.
Computed observables in Knockout JS are functions that automatically update whenever the underlying observables they depend on change.
Example:
var firstName = ko.observable('John'); var lastName = ko.observable('Doe'); var fullName = ko.computed(function() { return firstName() + ' ' + lastName(); });
问题 2
Explain the concept of custom bindings in Knockout JS.
Custom bindings in Knockout JS allow you to create reusable, encapsulated behaviors for handling specific aspects of the UI.
Example:
ko.bindingHandlers.fadeVisible = { init: function(element, valueAccessor) { var value = valueAccessor(); $(element).toggle(ko.unwrap(value)); }, update: function(element, valueAccessor) { var value = valueAccessor(); ko.unwrap(value) ? $(element).fadeIn() : $(element).fadeOut(); } };
问题 3
What is the purpose of the 'afterRender' callback in Knockout JS?
The 'afterRender' callback is used with the 'foreach' binding to execute a function after each item in the array is rendered in the UI.
Example:
; var items = ko.observableArray(['Item 1', 'Item 2']); function myCallback(elements) { console.log('Rendered elements:', elements); }
问题 4
Explain the 'templateOptions' property in Knockout JS.
The 'templateOptions' property allows you to pass additional options to a template specified in the 'template' binding.
Example:
; Details; var viewModel = { person: { name: 'John' } };
