JavaScript
语言：
JaveScriptBabelCoffeeScript
确定
(function(e, t) {
var n = ["touchstart", "touchmove", "touchend"];
e.enlarge = function(e, t, i) {
var s = document.getElementById(e);
var a = s.getElementsByTagName("img")[0];
var o = {
x: a.width / (t - a.width),
y: a.height / (i - a.height)
};
s.style.overflow = "hidden";
s.style.position = "relative";
s.innerHTML += '';
var l = s.getElementsByTagName("img")[1];
l.style.position = "absolute";
l.style.left = "0px";
l.style.top = "0px";
l.style.width = t + "px";
l.style.height = i + "px";
l.style.display = "none";
s.onclick = function() {
return false
};
var d = function(e) {
e.preventDefault();
var t = e.changedTouches[0].pageX - s.offsetLeft;
var n = e.changedTouches[0].pageY - s.offsetTop;
if (t < 0) t = 0;
if (n < 0) n = 0;
if (t > a.width) t = a.width;
if (n > a.height) n = a.height;
l.style.display = "block";
l.style.left = 0 - t / o.x + "px";
l.style.top = 0 - n / o.y + "px"
};
var h = function() {
l.style.display = "none"
};
s.addEventListener(n[0], d);
s.addEventListener(n[1], d);
s.addEventListener(n[2], h);
l.addEventListener(n[1], d);
l.addEventListener(n[2], h)
}
})(window);
window.onload = function() {
enlarge("demo", 1000, 1180);
}
