TouchList.item() - Web APIs 编辑

The item() method returns the Touch object at the specified index in the TouchList.

Syntax

var touchPoint = touchList.item(index);

Parameters

index

The index of the Touch object to retrieve. The index is a number in the range of 0 to one less than the length of the TouchList.

Return value

touchPoint

The requested Touch object from the TouchList. Returns null if the index is not less than the length of the list.

Example

This code example illustrates the use of the TouchList interface's item method and the length property.

target = document.getElementById("target");

target.addEventListener('touchstart', function(ev) {

  // If this touchstart event started on element target,
  // set touch to the first item in the targetTouches list;
  // otherwise set touch to the first item in the touches list
  var touch;

  if (ev.targetTouches.length >= 1)
     touch = ev.targetTouches.item(0);
  else
     touch = ev.touches.item(0);
}, false);

Specifications

Browser compatibility

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