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面试准备

Knockout JS 面试题与答案

The 'subscribe' method is used to register a callback function that will be called whenever the associated observable's value changes.

Example:

var myObservable = ko.observable('Initial value'); myObservable.subscribe(function(newValue) { console.log('New value:', newValue); });

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The 'foreach' and 'as' combination is used to alias the variable name used to represent each item in an array when using the 'foreach' binding.

Example:

; var items = ko.observableArray(['Item 1', 'Item 2']);

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The 'checked' binding is used to bind the checked state of a checkbox or radio input to an observable, enabling two-way data binding.

Example:

; var viewModel = { isChecked: ko.observable(true) };

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The 'hasfocus' binding is used to bind an observable to the focus state of an element, allowing you to track and control focus programmatically.

Example:

; var viewModel = { isFocused: ko.observable(true) };

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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); }

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