KeyboardEvent.isComposing 只读属性，返回一个 Boolean 值，表示该事件是否在 compositionstart 之后和 compositionend 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
标准
| Specification | Status | Comment |
|---|---|---|
| Document Object Model (DOM) Level 3 Events Specification KeyboardEvent.isComposing |
Obsolete | Initial definition. |
浏览器兼容性
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| 特性 | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| 基本支持 | 56.0 | 31.0 (31.0) | 未实现 | 43 | 未实现 |
| 特性 | Android Webview | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|
| 基本支持 | 56.0 | 31.0 (31.0) | 未实现 | 43 | 未实现 | 56.0 |