Touch.identifier - Web APIs 编辑

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The Touch.identifier returns a value uniquely identifying this point of contact with the touch surface. This value remains consistent for every event involving this finger's (or stylus's) movement on the surface until it is lifted off the surface.

Syntax

touchItem.identifier;

Return value

A long that represents the unique ID of the Touch object.

Example

someElement.addEventListener('touchmove', function(e) {
// Iterate through the list of touch points that changed
// since the last event and print each touch point's identifier.
  for (var i=0; i < e.changedTouches.length; i++) {
    console.log("changedTouches[" + i + "].identifier = " + e.changedTouches[i].identifier);
  }
}, false);

Specifications

Browser compatibility

BCD tables only load in the browser