h5项目需根据几条弯曲的线条让用户进行曲线式滑动，滑动时需实时响应某些样式，于是就有了下面这个实例。（可自定义多个子对象大小分别放在线条各处，以增加曲线滑动确认精度。）
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>手机端触屏手指曲线滑动确认</title>
<meta content="width=device-width,initial-scale=1.0,minimum-scale=1.0,user-scalable=no,maximum-scale=1.0" id="viewport" name="viewport">
<script type="text/javascript">
var touch_screen = {
//曲线滑动确认
curve_confirm: {
_object: null,
_object_children_length: null,
_object_children:null,
_is_start: false,
_fn: function() {},
start: function() {
var self = this;
//开始滑动
var start = function(e) {
self._is_start = true;
for (var i = 0, j = self._object_children_length; i < j; i++) {
var sub_object = self._object_children[i];
sub_object.setAttribute("alt", "");
sub_object.style.background = "";
}
}
//滑动中
var move = function(e) {
e.preventDefault();
var obj = self._object;
if (self._is_start) {
var x = e.targetTouches[0].pageX;
var y = e.targetTouches[0].pageY;
for (var i = 0; i < self._object_children_length * 2; i++) {
var _o = obj.childNodes[i],
_w = _o.offsetWidth,
_h = _o.offsetHeight;
_left = _o.offsetLeft, _top = _o.offsetTop;
if (x >= _left && x < (_left + _w) && y > _top && y < (_top + _h)) {
var sub_object = obj.childNodes[i];
sub_object.setAttribute("alt", "yes");
sub_object.style.background = "#f00";
}
}
}
}
//滑动结束时
var end = function(e) {
self._is_start = false;
var n = 0;
for (var i = 0, j = self._object_children_length; i < j; i++) {
var sub_object = self._object_children[i];
if (sub_object.getAttribute("alt") == "yes") {
n++;
}
}
if (n == self._object_children_length) {
n = 0;
if (typeof self._fn == "function") {
self._fn();
}
}
} document.addEventListener("touchstart", start, false);
document.addEventListener("touchmove", move, false);
document.addEventListener("touchend", end, false);
},
//初始化
init: function(o, fn) {
var class_clone = function(source) {
var result = {};
for (var key in source) {
result[key] = typeof source[key] === "object" ? class_clone(source[key]) : source[key];
}
return result;
}
var self = class_clone(touch_screen.curve_confirm);
self._object = document.getElementById(o);
self._object_children = self._object.getElementsByTagName("div");
self._object_children_length = self._object_children.length;
self._fn = fn;
if (!self._object) {
alert('bind_object is not an object');
return false;
}
self.start();
}
}
} //页面加载完成
window.onload = function() {
touch_screen.curve_confirm.init("curve_item", function() {
alert("曲线已匹配！");
});
}
</script> <style type="text/css">
html, body {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
overflow: hidden;
background: #000;
}
#curve_item div {
background: #0F6;
position:absolute;
width:50px;
height:50px;
}
#curve_item #a { top:20px; left:20px; }
#curve_item #b { top:100px; left:100px; }
#curve_item #c { top:200px; left:200px; }
#curve_item #d { top:300px; left:100px; }
#curve_item #e { top:400px; left:20px; }
</style>
</head> <body>
<div id="curve_item">
<div id="a"></div>
<div id="b"></div>
<div id="c"></div>
<div id="d"></div>
<div id="e"></div>
</div>
</body>
</html>