Touch.clientY
read-only property returns the Y coordinate of the touch point relative to the browser's viewport, not including any scroll offset.
touchItem.clientY;
A
long
value representing the Y coordinate of the touch point relative to the viewport, not including any scroll offset.
This example illustrates using the
触摸
对象的
Touch.clientX
and
Touch.clientY
特性。
Touch.clientX
property is the horizontal coordinate of a touch point relative to the browser's viewport excluding any scroll offset. The
Touch.clientY
property is the vertical coordinate of the touch point relative to the browser's viewport excluding any scroll offset.
In this example, we assume the user initiates a touch on an element with an id of
source
, moves within the element or out of the element and then releases contact with the surface. When the
touchend
event handler is invoked, the changes in the
Touch.clientX
and
Touch.clientY
coordinates, from the starting touch point to the ending touch point, are calculated.
// Register touchstart and touchend listeners for element 'source'
var src = document.getElementById("source");
var clientX, clientY;
src.addEventListener('touchstart', function(e) {
// Cache the client X/Y coordinates
clientX = e.touches[0].clientX;
clientY = e.touches[0].clientY;
}, false);
src.addEventListener('touchend', function(e) {
var deltaX, deltaY;
// Compute the change in X and Y coordinates.
// The first touch point in the changedTouches
// list is the touch point that was just removed from the surface.
deltaX = e.changedTouches[0].clientX - clientX;
deltaY = e.changedTouches[0].clientY - clientY;
// Process the data ...
}, false);
| 规范 | 状态 | 注释 |
|---|---|---|
| Touch Events – Level 2 | 草案 | No changes since last version. |
| 触摸事件 | 推荐 | 初始定义。 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
clientY
|
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。