第一种情况比较简单,弹框和页面都不可滚动
<input type="button" value="click me" id="btn">
<div class="mask" id="mask">
<div class="box">
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<input type="button" value="close" id="close">
</div>
</div>
.mask{
position: fixed;
top: 0;
left: 0;
z-index: 999;
width: 100%;
height: 100%;
display: none;
background: rgba(0,0,0,.7);
}
.box{
position: absolute;
top: 50%;
left: 50%;
transform: translate3d(-50%, -50%, 0);
padding: 10px;
background: #fff;
text-align: center;
}
var oBtn = document.getElementById("btn"),
oMask = document.getElementById("mask"),
oBox = document.getElementById("box"),
oClose = document.getElementById("close");
oBtn.onclick = () => {
oMask.style.display = 'block';
}
oClose.onclick = () => {
oMask.style.display = 'none';
}
oMask.addEventListener('touchmove', (e) => {
e.preventDefault();
});
第二种情况是弹框可滚动,页面不可滚动
1.移动端兼容性不好,可应用于pc端
<input type="button" value="click me" id="btn">
<div class="mask" id="mask">
<div class="box">
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<input type="button" value="close" id="close">
</div>
</div>
.mask{
position: fixed;
top: 0;
left: 0;
z-index: 999;
width: 100%;
height: 100%;
display: none;
background: rgba(0,0,0,.7);
}
.box{
position: absolute;
top: 50%;
left: 50%;
transform: translate3d(-50%, -50%, 0);
width: 200px;
height: 200px;
padding: 10px;
overflow-y: scroll;
-webkit-overflow-scrolling : touch;
background: #fff;
text-align: center;
}
var oBtn = document.getElementById("btn"),
oMask = document.getElementById("mask"),
oBox = document.getElementById("box"),
oClose = document.getElementById("close");
oBtn.onclick = () => {
oMask.style.display = 'block';
document.body.style.height = '100%';
document.body.style.overflow = 'hidden';
document.documentElement.style.overflow='hidden'
}
oClose.onclick = () => {
oMask.style.display = 'none';
document.body.style.height = 'auto';
document.body.style.overflow = 'scroll';
document.documentElement.style.overflow='scroll'
}
2.适用于移动端
<input type="button" value="click me" id="btn">
<div class="maskWrap" id="maskWrap">
<div class="mask" id="mask"></div>
<div class="box" id="box">
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<h1>this is a box</h1>
<input type="button" value="close" id="close">
</div>
</div>
.maskWrap{
position: fixed;
top: 0;
left: 0;
z-index: 999;
width: 100%;
height: 100%;
display: none;
}
.mask{
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
z-index: 1;
background-color: rgba(0, 0, 0, .7);
}
.box{
position: absolute;
top: 50%;
left: 50%;
transform: translate3d(-50%, -50%, 0);
z-index: 2;
width: 200px;
height: 200px;
overflow-y: scroll;
-webkit-overflow-scrolling : touch;
padding: 10px;
background: #fff;
text-align: center;
}
var oBtn = document.getElementById("btn"),
oMaskWrap = document.getElementById("maskWrap"),
oMask = document.getElementById("mask"),
oBox = document.getElementById("box"),
oClose = document.getElementById("close");
oBtn.onclick = () => {
oMaskWrap.style.display = 'block';
}
oClose.onclick = () => {
oMaskWrap.style.display = 'none';
}
oMask.addEventListener('touchstart', (e) => {
e.preventDefault();
});
let startY = 0; // 记录开始滑动的坐标,用于判断滑动方向
let status = 0; // 0:未开始,1:已开始,2:滑动中
// 核心部分
oBox.addEventListener('touchstart', e => {
status = 1;
startY = e.targetTouches[0].pageY;
}, false);
oBox.addEventListener('touchmove', e => {
// 判定一次就够了
if (status !== 1) return;
status = 2;
let t = e.target || e.srcElement;
let py = e.targetTouches[0].pageY;
let ch = t.clientHeight; // 内容可视高度
let sh = t.scrollHeight; // 内容滚动高度
let st = t.scrollTop; // 当前滚动高度
// 已经到头部尽头了还要向上滑动,阻止它
if (st === 0 && py > startY) {
// console.log(st + '/' + py + '/' + startY);
e.preventDefault();
}
// 已经到低部尽头了还要向下滑动,阻止它
if ((st === sh - ch) && py < startY) {
// console.log(st + '/' + (sh - ch) + '/' + py + '/' + startY);
e.preventDefault();
}
}, false);
oBox.addEventListener('touchend', e => {
status = 0;
}, false);
3.适用于移动端和pc端
var oBtn = document.getElementById("btn"),
oMaskWrap = document.getElementById("maskWrap"),
oMask = document.getElementById("mask"),
oBox = document.getElementById("box"),
oClose = document.getElementById("close");
var isFixed = 0;
oBtn.onclick = () => {
oMaskWrap.style.display = 'block';
isFixed = 1;
}
oClose.onclick = () => {
oMaskWrap.style.display = 'none';
isFixed = 0;
}
var bodyEl = document.body;
var top = 0;
function stopBodyScroll (isFixed) {
console.log(isFixed)
if (isFixed) {
top = window.scrollY;
bodyEl.style.position = 'fixed';
bodyEl.style.top = -top + 'px';
} else {
bodyEl.style.position = '';
bodyEl.style.top = '';
window.scrollTo(0, top); // 回到原先的top
}
}
// window.onscroll = stopBodyScroll(isFixed);
document.addEventListener("onscroll", function (e) {
stopBodyScroll(isFixed);
})
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