CanvasRenderingContext2D.clearHitRegions()
已废弃: This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
CanvasRenderingContext2D.clearHitRegions() 是 Canvas 2D API 在画布中删除所有点击区域的方法。
语法
void ctx.clearHitRegions();
示例
使用 clearHitRegions 方法
这仅是一段简单的使用 clearHitRegions 方法的代码片段。
HTML
<canvas id="canvas"></canvas>
JavaScript
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
// set some hit regions
ctx.addHitRegion({id: "eyes"});
ctx.addHitRegion({id: "nose"});
ctx.addHitRegion({id: "mouth"});
// remove them altogether from the canvas
ctx.clearHitRegions();
规范描述
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard CanvasRenderingContext2D.clearHitRegions |
Living Standard |
浏览器兼容性
We're converting our compatibility data into a machine-readable JSON format.
This compatibility table still uses the old format,
because we haven't yet converted the data it contains.
Find out how you can help! (en-US)
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes)[1] | 38 (38) [2] | 未实现 | 未实现 | 未实现 |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | 未实现 | 未实现 | 38.0 (38) [2] | 未实现 | 未实现 | 未实现 |
兼容性注解
- [1] 此特性需要一个特性标志。 设置
ExperimentalCanvasFeatures标志为true进行启用。 - [2] 此特性需要一个特性偏好设置。 在 about:config中设置
canvas.hitregions.enabled为 true。