touch.js-scale

DOCTYPE html>

<html>


<head>

<meta charset="UTF-8">

<meta name="viewport" content="width=device-width, initial-scale=1.0, 

maximum-scale=1.0, user-scalable=0">

<title>title>

head>


<body>

<img src="img/cloud.png" id="target" />

<script src="js/touch.js" type="text/javascript" charset="utf-8">script>

<script type="text/javascript">

var target = document.getElementById("target");

target.style.webkitTransition = 'all ease 0.05s';


touch.on('#target', 'touchstart', function(ev) {

ev.preventDefault();

});


var initialScale = 1;

var currentScale;


touch.on('#target', 'pinchend', function(ev) {

currentScale = ev.scale - 1;

currentScale = initialScale + currentScale;

currentScale = currentScale > 2 ? 2 : currentScale;

currentScale = currentScale < 1 ? 1 : currentScale;

this.style.webkitTransform = 'scale(' + currentScale + ')';

console.log("当前缩放比例为:" + currentScale + ".");

});


touch.on('#target', 'pinchend', function(ev) {

initialScale = currentScale;

});

script>

body>


html>

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