我如何从滑动检测中获得负数?
How would i get negative numbers from swipe detection?
我有一个名为 x
的变量作为起点,myCount
用于计算用户完成的每次滑动,最后一个变量 dist
returns 特定距离起点多远的数字。
如果 dist
将在 -201 下由用户拖动(在移动设备中滑动)到左侧,我想将 -1 存储在 myCount
中。
存储正数工作正常(通过拖动右侧),但它永远不会存储负数。
有解决这个问题的方法吗?
这是我到目前为止自己所做的:
$(function stripeAnimeModule() {
// Variables
var screen = $('.page1'),
buttons = $('.buttons').find('.button'),
myCount = 1,
x,
dist;
// Functions
function clicked(e) {
if ($(this).hasClass('prev')) {
myCount -= 1;
console.log(myCount, 'this is clicked');
} else {
myCount += 1;
console.log(myCount);
}
}
function touchStart(e) {
return x = e.touches[0].pageX;
e.preventDefault();
}
function touchMove(e) {
var drag = e.touches[0].pageX;
var dist = Math.sqrt(x + drag);
e.preventDefault();
}
function touchEnd(e) {
var dist = e.changedTouches[0].pageX - x;
if (dist < Math.abs(-200)) {
myCount = myCount;
console.log('nothing', dist, myCount);
} else if (dist > 201) {
myCount += 1;
console.log('distance is: ' + dist, x, 'myCount is: '+ myCount);
} else if (dist > -201) {
myCount -= 1;
console.log('distance is: ' + dist, x, 'myCount is: '+ myCount);
}
e.stopPropagation();
e.preventDefault();
}
buttons.on({click: clicked});
screen.bind({touchstart:touchStart, touchmove:touchMove, touchend: touchEnd});
})
* {
margin: 0;
padding: 0;
}
ul li {
list-style: none;
}
a {
display: block;
}
.page1 {
position: absolute;
width: 100vw;
height: 100vh;
background-color: grey;
}
.buttons {
z-index: 1;
}
.prev {
position: absolute;
left: 0;
margin: 0 40px;
}
.shrink {
position: absolute;
}
.next {
position: absolute;
right: 0;
margin: 0 40px;
}
<div class="page1" href="#"></div>
<ul class="buttons">
<li class="button prev">Prev</li>
<li class="shrink"></li>
<li class="button next">Next</li>
</ul>
<br><br><br><br><br><br><br><br><br><br><br><br><br>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
$(function stripeAnimeModule() {
// Variables
var screen = $('.page1'),
buttons = $('.buttons').find('.button'),
myCount = 1,
x,
dist;
// Functions
function clicked(e) {
if ($(this).hasClass('prev')) {
myCount -= 1;
console.log(myCount, 'this is clicked');
} else {
myCount += 1;
console.log(myCount);
}
}
function touchStart(e) {
return x = e.touches[0].pageX;
e.preventDefault();
}
function touchMove(e) {
var drag = e.touches[0].pageX;
var dist = Math.sqrt(x + drag);
e.preventDefault();
}
function touchEnd(e) {
var dist = e.changedTouches[0].pageX - x;
if (dist > 201) {
myCount += 1;
console.log('distance is: ' + dist, x, 'myCount is: '+ myCount);
} else if (dist < -201) {
myCount -= 1;
console.log('distance is: ' + dist, x, 'myCount is: '+ myCount);
} else {
myCount = myCount;
console.log('nothing', dist, myCount);
}
e.stopPropagation();
e.preventDefault();
}
buttons.on({click: clicked});
screen.bind({touchstart:touchStart, touchmove:touchMove, touchend: touchEnd});
})
* {
margin: 0;
padding: 0;
}
ul li {
list-style: none;
}
a {
display: block;
}
.page1 {
position: absolute;
width: 100vw;
height: 100vh;
background-color: grey;
}
.buttons {
z-index: 1;
}
.prev {
position: absolute;
left: 0;
margin: 0 40px;
}
.shrink {
position: absolute;
}
.next {
position: absolute;
right: 0;
margin: 0 40px;
}
<div class="page1" href="#"></div>
<ul class="buttons">
<li class="button prev">Prev</li>
<li class="shrink"></li>
<li class="button next">Next</li>
</ul>
<br><br><br><br><br><br><br><br><br><br><br><br><br>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
请看一下,如果这就是您要找的,请告诉我。