var holdFlag = false,
id_scale = document.getElementById("scale"),
moveFlag = false,
holdTimestamp = 0,
touches = [],
size = 0.01,
_scale = 1,
touch1X, touch2X;
var touchArea = document.querySelector('#touchArea');
touchArea.addEventListener('touchstart', function (event) {
event.preventDefault();
holdFlag = true;
holdTimestamp = (new Date()).getTime();
touches = event.touches;
//alert(1)
//console.log(1)
//alert(touches.length)
//touch1X = touches[0].clientX;
//if (touches.length == 2) {
//touch1X = touches[0].clientX;
// touch2X = touches[1].clientX;
// }
}, false);
touchArea.addEventListener('touchmove', function (event) {
event.preventDefault();
var _touches = event.touches;
moveFlag = true;
if (touches.length == 2) {
if (holdFlag) {
touch1X = touches[0].clientX;
touch2X = touches[1].clientX;
holdFlag = false;
}
if ((touch1X > _touches[0].clientX && touch2X < _touches[1].clientX) || (touch1X == _touches[0].clientX && touch2X < _touches[1].clientX) || (touch1X > _touches[0].clientX && touch2X == _touches[1].clientX)) {//放大
_scale = _scale + size;
//alert(2 + " " + _scale)
console.log(2)
if (_scale < 2 && _scale > 1)
id_scale.style.transform = 'scale(' + _scale + ')';
}
else if ((touch1X < _touches[0].clientX && touch2X > _touches[1].clientX) || (touch1X == _touches[0].clientX && touch2X > _touches[1].clientX) || (touch1X < _touches[0].clientX && touch2X == _touches[1].clientX)) {//缩小
_scale = _scale - size;
// alert(3 + " " + _scale)
console.log(3)
if (_scale > 1 && _scale < 2)
id_scale.style.transform = 'scale(' + _scale + ')';
}
}
});
不知道最后两个判断不知道问题出在哪里了 最上面的明明是代表手势撑开 然后有时候会放大有时候会缩小 |
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