Knockout.js 3.4.0RC 发布 JavaScript 的 UI 库

Knockout.js 3.4.0 RC 发布，此版本更新内容如下：

#1715 – Add ko.onError handler that provides more consistent error/stack information for async operations and event handlers
#1728 – Include deferred updates functionality in Knockout core
- #1738 – Deferred Updates 1 – ko tasks functionality; deferred extender for enabling deferred Updates
- #1753 – Deferred Updates 2 – add ability to turn on deferred updates globally by settingko.options.deferUpdates = true;
- #1795 – Deferred Updates 3 – dependency tree scheduling
#1774 – Add ko.options.useOnlyNativeEvents (default false) that can control if KO uses jQuery (if available) for binding events
#1839 – Performance Improvement – for named templates that use a template or normal element use the element directly as the template to clone
#1840 – Performance Improvement – Make observables 2-3x faster to instantiate and reduce memory usage by 50%
#1841 – Performance Improvement – Make computeds 2x faster to instantiate and reduce memory usage by 50%
#1870 – Add ko.isPureComputed.

#1256 – Better handling when an item is added while a beforeRemove animation is running
#1380 – observableArray sort and reverse methods now return the observableArray rather than the underlying array
#1510 – Do not define a custom element when a component name matches a standard element
#1591 – Make checked binding work properly with writable computed observables
#1613 – IE8 issue with calling .apply with an empty second argument
#1683 – Rearrange code to avoid prototype issue in Opera mobile
#1709 – dontLimitMoves option should be respected when comparing arrays
#1718 – ko.toJS no longer replaces RegExp objects with plain objects
#1756 – Use a hasOwnProperty check when registering components
#1781 – Trim string in default css binding
#1783 – Skip template elements when binding
#1788 – Fix textInput edge case in IE9
#1790 – Remove version from bower.json and don’t update it in build
#1794 – Exception in an afterAdd callback should not cause duplicate elements
#1810 – Don’t check for require for CommonJS
#1855 – Fix potential memory leak in component binding
#1893 – hasFocus fixes in IE