Returns the X coordinate of the touch point relative to the screen, not including any scroll offset.
var x = touchItem.screenX;
x
The X coordinate of the touch point relative to the screen, not including any scroll offset.
This example illustrates how to access the
触摸
对象的
Touch.screenX
and
Touch.screenY
特性。
Touch.screenX
property is the horizontal (x) coordinate of a touch point relative to the screen in CSS pixels. The
Touch.screenY
property is the vertical coordinate of a touch point relative to the screen in CSS pixels.
In following simple code snippet, we assume the user initiates multiple touch contacts on an element with an id of
source
and then releases contacts with the surface. When the
touchstart
event handler is invoked, each touch point's
Touch.screenX
and
Touch.screenY
coordinates are accessed.
// Register a touchstart listeners for the 'source' element
var src = document.getElementById("source");
src.addEventListener('touchstart', function(e) {
// Iterate through the touch points and log each screenX/Y coordinate.
// The unit of each coordinate is CSS pixels.
var i;
for (i=0; i < e.touches.length; i++) {
console.log("touchpoint[" + i + "].screenX = " + e.touches[i].screenX);
console.log("touchpoint[" + i + "].screenY = " + e.touches[i].screenY);
}
}, false);
| 规范 | 状态 | 注释 |
|---|---|---|
| Touch Events – Level 2 | 草案 | 非稳定版本。 |
| 触摸事件 | 推荐 | 初始定义。 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
screenX
|
Chrome 22 | Edge ≤18 |
Firefox
52
|
IE No | Opera Yes | Safari No | WebView Android Yes | Chrome Android Yes | Firefox Android 6 | Opera Android Yes | Safari iOS Yes | Samsung Internet Android Yes |
完整支持
不支持
见实现注意事项。