KeyboardEvent.isComposing
KeyboardEvent.isComposing 只读属性，返回一个 Boolean 值，表示该事件是否在 compositionstart (en-US) 之后和 compositionend (en-US) 之前被触发。
语法
var bool = event.isComposing;
示例
var kbdEvent = new KeyboardEvent("syntheticKey", false);
console.log(kbdEvent.isComposing); // return false
规范
| Specification |
|---|
| UI Events # dom-keyboardevent-iscomposing |
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