如何解决粘性导航栏，滚动到第一个元素不精确
我正在尝试制作一个导航栏，该导航栏在滚动到第一个元素后会停留在顶部，例如'新闻'。通过点击“新闻”来进行不精确的工作。它向下滚动很多，在再次按下“新闻”之后，它又向上滚动回到了正确的位置。奇怪的是，它仅发生在navBar的第一个元素上。我该如何解决？
/*Base*/
.contentBody{
background-color: white;
}
/*Sections*/
html {
scroll-behavior: smooth;
}
#header{}
#news{}
#products{background-color: aqua;}
#services{}
#customers{}
#community{}
#contact{}
#about{}
#footer{}
/*Width Element*/
.fitWidth{
width: -webkit-fill-available;
}
.width100{
width: 100%;
}
.fitContBoxLeft{
display: inline-block;
float: left;
}
.fitContBoxRight{
display: inline-block;
float: right;
}
/**/
/*Borders*/
.roundedBorader{
border-radius: 50%;
}
.roundedBox{
border: 1px solid lightgrey;
border-radius: 12px;
}
/*Div*/
.headingBox{
position: relative
background-color: lightgrey;
height: 268;
}
.news{
background-color: purple;
}
.products{
background-color: white;
}
.services{
background-color: limegreen;
}
.customers{
background-color: blue;
}
.pBox1{
float:left;
width: 24.7%;
margin: 1px;
border-radius: 5px;
text-align: center;
}
.headBottomLine{
height: 12%;
width: 100%;
background-color: grey;
}
.leftBox50{
height: auto;
float: left;
background-color: white;
width: 49%;
margin: 2px;
}
.rightBox50{
height: auto;
float: left;
background-color: white;
width: 49%;
margin: 2px;
}
.bodyBox{
height: 200px;
background-color: grey;
}
.aboutUs{
height: 200px;
background-color: white;
}
.footerBox{
min-height: 300px;
background-color: black;
}
/*Backgrounds*/
.headBG{
background-image: url("https://www.toptal.com/designers/subtlepatterns/patterns/double-bubble.png");
background-size: cover;
}
/*Position*/
.bottom0{
bottom: 0;
}
.posRel{
position: relative;
}
.posAbs{
position: absolute;
}
/*Float*/
.floatLeft{
float: left;
}
.floatRight{
float: right;
}
/*Alignment*/
.justiText{
text-align: justify;
}
.rightText{
text-align: right;
}
.leftText{
text-align: left;
}
.centerText{
text-align: center;
}
.alignBox{
display: flex;
justify-content: center;
}
/*Padding*/
.pAll-5{
padding: 5%;
}
.pTop-8{
padding-top: 8%;
}
.pTop-5{
padding-top: 5%;
}
.pTop-2{
padding-top: 2%;
}
.mTop-n3{
margin-top: -3%;
}
.mTop-5{
margin-top: auto;
}
.mTop-6{
margin-top: 6%;
}
.pLine{
width:100%;
}
.pLR{
padding-left: 5%;
padding-right: 5%;
}
.pBot-12{
padding-bottom: 12%;
}
.pTop-10{
padding-top: 10%;
}
.pTop-6{
padding-top: 6%;
}
.pTop-1{
padding-top: 2%;
}
.pLeft-30{
padding-left: 30%;
}
.pLeft-25{
padding-left: 25%;
}
.pLeft-20{
padding-left: 20%;
}
.pLeft-10{
padding-left: 10%;
}
.pLeft-5{
padding-left: 5%;
}
.pRight-5{
padding-right: 5%;
}
.pTop-4{
padding-top: 4%;
}
.pAll-20{
padding: 20px;
}
.pLTRB{
padding-left: 15%;
padding-top: 2%;
padding-bottom: 5%;
}
.centerHeadLine{
padding-bottom: 7%;
}
/*Colors*/
.white{
color: white;
}
.black{
color: black;
}
.grey{
color: grey;
}
.lightgrey{
color: lightgrey;
}
div.c{
color: lightgrey;
}
div.b{
color: white;
}
div.a{
color: black;
}
.bgCol-black{
background-color: black;
}
.bgCol-grey{
background-color: grey;
}
.bgCol-purple{
background-color: #8e42c7;
}
.bgCol-white{
background-color: white;
}
.bgCol-lightgrey{
background-color: lightgrey;
}
.bgCol-limegreen{
background-color: limegreen;
}
.bgLightGreyX{
background-color: #d5d2d670;
}
/*Filter styles*/
.saturate { filter: saturate(3); }
.grayscale { filter: grayscale(100%); }
.contrast { filter: contrast(160%); }
.brightness { filter: brightness(0.25); }
.blur { filter: blur(3px); }
.invert { filter: invert(100%); }
.sepia { filter: sepia(100%); }
.huerotate { filter: hue-rotate(180deg); }
.rss.opacity { filter: opacity(50%); }
/*Heading Colors*/
h1.a{
color: white;
}
h1.b{
color: black;
}
h5.a{
color: white;
}
h4.b{
color: black;
}
h4.a{
color: white;
}
h5.b{
color: black;
}
/*Body*/
body {
margin: 0;
font-size: 20px;
font-family: Arial,Helvetica,sans-serif;
}
/*NavBar*/
.navbar {
overflow: hidden;
background-color: #333;
}
.navbar a {
float: left;
font-size: 16px;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
/*Nav-Dropdown*/
.dropdown {
float: left;
overflow: hidden;
}
.dropdown .dropbtn {
font-size: 16px;
border: none;
outline: none;
color: white;
padding: 14px 16px;
background-color: inherit;
font-family: inherit;
margin: 0;
}
.navbar a:hover,.dropdown:hover .dropbtn {
background-color: #ea8013;
}
.dropdown-content {
display: none;
position: fixed;
background-color: #333;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0.2);
z-index: 1;
}
.dropdown-content a {
float: none;
color: white;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {
background-color: #94a25c;
}
.dropdown:hover .dropdown-content {
display: block;
}
/* The sticky class*/
.sticky {
position: fixed;
top: 0;
width: 100%;
}
.sticky + .content {
padding-top: 0px;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!---------------------------------------------------Header--------------------------------------------------->
<div class='headBG posRel' id='home'>
<div class='pTop-4 pLeft-10'>
<img class='floatLeft roundedBorader' src='https://pbs.twimg.com/media/EaZSuXXXkAAMtJ5?format=jpg&name=360x360' height="150" width="150"/>
<div class='centerHeadLine pLeft-25'>
<h1 class='b'>Welcome friends</h1>
<h5 class='b'><u>The spot where we test some html,css and js</u></h5>
</div>
</div>
<!--NAV-->
<div class="navbar fitWidth" id="navbar">
<a class="active" href="#home">Home</a>
<a class="" href="#news">News</a>
<a class="" href="#products">Products</a>
<a class="" href="#services">Services</a>
<a class="" href="#customers">Customers</a>
<a class="" href="#community">Community</a>
<a class="" href="#contact">Contact</a>
<div class="dropdown">
<button class="dropbtn">About
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<!-- //TODO: Modals als POP up einbauen,mit jeweiligen content -->
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
</div>
</div>
<!---------------------------------------------------Content-------------------------------------------------->
<div class='contentBody'>
<!--News-->
<div class='news' id="news">
<h1 class='a centerText pTop-5 mTop-5'>News</h1>
<h5 class='a centerText'>Stay tunned with our News</h5>
<div class='alignBox'>
<div class='leftBox50 alignBox roundedBox'>
<div class='centerText'>
<h4>Lorem ipsum</h4>
<p>Lorem ipsum dolor sit amet,consetetur sadipscing elitr,sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat,sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren,no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
</div>
</div>
<div class='rightBox50 alignBox roundedBox'>
<div class='centerText'>
<h4>Lorem ipsum</h4>
<p>Lorem ipsum dolor sit amet,no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
</div>
</div>
</div>
<div class='alignBox pAll-20' id=''>
<form action="/action_page.php">
<label class='white' for="lname">Newsletter:</label>
<input type="text" id="lname" name="lname">
<input type="submit" value="Submit">
</form>
</div>
</div>
<!--//News-->
<!--Products-->
<div class='products' id='products'>
<h1 class='centerText pTop-6 mTop-5'>Products</h1>
<h5 class='b centerText'>Stay tunned with our products</h5>
<div class='leftText pAll-20'>
<h4>Lorem ipsum</h4>
<p>Lorem ipsum dolor sit amet,no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
</div>
<div class='pAll-20'>
<div class='white pBox1 bgLightGreyX'>
<img class='pTop-5' src='https://via.placeholder.com/150'/><br>
<p>Product #1</p>
</div>
<div class='white pBox1 bgLightGreyX'>
<img class='pTop-5' src='https://via.placeholder.com/150'/><br>
<p>Product #2</p>
</div>
<div class='white pBox1 bgLightGreyX'>
<img class='pTop-5' src='https://via.placeholder.com/150'/><br>
<p>Product #3</p>
</div>
<div class='white pBox1 bgLightGreyX'>
<img class='pTop-5' src='https://via.placeholder.com/150'/><br>
<p class='black'>Product #4</p>
</div>
</div>
<div class='pTop-10 pLR'>
<p>Lorem ipsum dolor sit amet,no sea takimata sanctus e</p>
</div>
</div>
<!--//Products-->
<!--Services-->
<div class='services' id='services'>
<h1 class='centerText pTop-5 mTop-5'>tile#1</h1>
<h5 class='b centerText'>Stay tunned with our Services</h5>
<div class='pLeft-5 fitContBoxLeft roundedBox'>
<img class='floatLeft' src='https://via.placeholder.com/50'/><br>
<div class='floatLeft pLeft-5'>tile#2</div>
</div>
<div class='pRight-5 fitContBoxRight roundedBox'>
<img class='floatRight' src='https://via.placeholder.com/50'/><br>
<div class='floatRight pRight-5'>tile#3</div>
</div>
<div class='pLeft-5 fitContBoxLeft roundedBox'>
<img class='floatLeft' src='https://via.placeholder.com/50'/><br>
<div class='floatLeft pLeft-5'>tile#4</div>
</div>
<div class='pRight-5 fitContBoxRight roundedBox'>
<img class='floatRight' src='https://via.placeholder.com/50'/><br>
<div class='floatRight pRight-5'>tile#5</div>
</div>
<h4 class='centerText pTop-5'>asdfadsf asdf asdf asd f asdfvices</h4>
<div class=''></div>
</div>
<!--//Services-->
<!--Customers-->
<div class='customers' id='customers'>
<h1 class='a centerText'>Customers</h1>
<div class=''></div>
<div class=''></div>
<p>jgfjhgfghjf</p>
</div>
<!--//Customers-->
<!--Community-->
<div class='' id='Community'>
<h1 class='a centerText'>Community</h1>
<div class=''></div>
<div class=''></div>
</div>
<!--//Community-->
<!--Contact-->
<div class='' id='Contact'>
<h1 class='a centerText'>Contact</h1>
<div class=''></div>
<div class=''></div>
</div>
<!--//Contact-->
<!--About-->
<div class='aboutUs'>
<div></div>
</div>
<!--//About-->
</>
<!---------------------------------------------------Footer--------------------------------------------------->
<div class='footerBox'>
<div></div>
</div>parser.hooks.call
.for("require")
.tap("CompatibilityPlugin",expr => {
// support for browserify style require delegator: "require(o,!0)"
if (expr.arguments.length !== 2) return;
...
解决方法
您需要将其更改为JS / JQuery，在我的情况下为JQuery。添加此脚本，您将拥有更多控制权，并且如果将,0更改为毫秒，则可以制作动画。请注意，我是从容器位置减去导航栏高度。
$(document).ready(function(){
$("#navbar a").click(function(e) {
e.preventDefault();
$('html,body').animate({
scrollTop: $($.attr(this,'href')).offset().top - $("#navbar").height()
},0);
});
});
//Sticky-NavBar
window.onscroll = function() {stickyNavBar()};
var navbar = document.getElementById("navbar");
var sticky = navbar.offsetTop;
function stickyNavBar() {
if (window.pageYOffset >= sticky) {
navbar.classList.add("sticky")
} else {
navbar.classList.remove("sticky");
}
}
$(document).ready(function(){
$("#navbar a").click(function(e) {
e.preventDefault();
$('html,0);
});
});/*Base*/
.contentBody{
background-color: white;
}
/*Sections*/
html {
scroll-behavior: smooth;
}
#header{}
#news{}
#products{background-color: aqua;}
#services{}
#customers{}
#community{}
#contact{}
#about{}
#footer{}
/*Width Element*/
.fitWidth{
width: -webkit-fill-available;
}
.width100{
width: 100%;
}
.fitContBoxLeft{
display: inline-block;
float: left;
}
.fitContBoxRight{
display: inline-block;
float: right;
}
/**/
/*Borders*/
.roundedBorader{
border-radius: 50%;
}
.roundedBox{
border: 1px solid lightgrey;
border-radius: 12px;
}
/*Div*/
.headingBox{
position: relative
background-color: lightgrey;
height: 268;
}
.news{
background-color: purple;
}
.products{
background-color: white;
}
.services{
background-color: limegreen;
}
.customers{
background-color: blue;
}
.pBox1{
float:left;
width: 24.7%;
margin: 1px;
border-radius: 5px;
text-align: center;
}
.headBottomLine{
height: 12%;
width: 100%;
background-color: grey;
}
.leftBox50{
height: auto;
float: left;
background-color: white;
width: 49%;
margin: 2px;
}
.rightBox50{
height: auto;
float: left;
background-color: white;
width: 49%;
margin: 2px;
}
.bodyBox{
height: 200px;
background-color: grey;
}
.aboutUs{
height: 200px;
background-color: white;
}
.footerBox{
min-height: 300px;
background-color: black;
}
/*Backgrounds*/
.headBG{
background-image: url("https://www.toptal.com/designers/subtlepatterns/patterns/double-bubble.png");
background-size: cover;
}
/*Position*/
.bottom0{
bottom: 0;
}
.posRel{
position: relative;
}
.posAbs{
position: absolute;
}
/*Float*/
.floatLeft{
float: left;
}
.floatRight{
float: right;
}
/*Alignment*/
.justiText{
text-align: justify;
}
.rightText{
text-align: right;
}
.leftText{
text-align: left;
}
.centerText{
text-align: center;
}
.alignBox{
display: flex;
justify-content: center;
}
/*Padding*/
.pAll-5{
padding: 5%;
}
.pTop-8{
padding-top: 8%;
}
.pTop-5{
padding-top: 5%;
}
.pTop-2{
padding-top: 2%;
}
.mTop-n3{
margin-top: -3%;
}
.mTop-5{
margin-top: auto;
}
.mTop-6{
margin-top: 6%;
}
.pLine{
width:100%;
}
.pLR{
padding-left: 5%;
padding-right: 5%;
}
.pBot-12{
padding-bottom: 12%;
}
.pTop-10{
padding-top: 10%;
}
.pTop-6{
padding-top: 6%;
}
.pTop-1{
padding-top: 2%;
}
.pLeft-30{
padding-left: 30%;
}
.pLeft-25{
padding-left: 25%;
}
.pLeft-20{
padding-left: 20%;
}
.pLeft-10{
padding-left: 10%;
}
.pLeft-5{
padding-left: 5%;
}
.pRight-5{
padding-right: 5%;
}
.pTop-4{
padding-top: 4%;
}
.pAll-20{
padding: 20px;
}
.pLTRB{
padding-left: 15%;
padding-top: 2%;
padding-bottom: 5%;
}
.centerHeadLine{
padding-bottom: 7%;
}
/*Colors*/
.white{
color: white;
}
.black{
color: black;
}
.grey{
color: grey;
}
.lightgrey{
color: lightgrey;
}
div.c{
color: lightgrey;
}
div.b{
color: white;
}
div.a{
color: black;
}
.bgCol-black{
background-color: black;
}
.bgCol-grey{
background-color: grey;
}
.bgCol-purple{
background-color: #8e42c7;
}
.bgCol-white{
background-color: white;
}
.bgCol-lightgrey{
background-color: lightgrey;
}
.bgCol-limegreen{
background-color: limegreen;
}
.bgLightGreyX{
background-color: #d5d2d670;
}
/*Filter styles*/
.saturate { filter: saturate(3); }
.grayscale { filter: grayscale(100%); }
.contrast { filter: contrast(160%); }
.brightness { filter: brightness(0.25); }
.blur { filter: blur(3px); }
.invert { filter: invert(100%); }
.sepia { filter: sepia(100%); }
.huerotate { filter: hue-rotate(180deg); }
.rss.opacity { filter: opacity(50%); }
/*Heading Colors*/
h1.a{
color: white;
}
h1.b{
color: black;
}
h5.a{
color: white;
}
h4.b{
color: black;
}
h4.a{
color: white;
}
h5.b{
color: black;
}
/*Body*/
body {
margin: 0;
font-size: 20px;
font-family: Arial,Helvetica,sans-serif;
}
/*NavBar*/
.navbar {
overflow: hidden;
background-color: #333;
}
.navbar a {
float: left;
font-size: 16px;
color: white;
text-align: center;
padding: 14px 16px;
text-decoration: none;
}
/*Nav-Dropdown*/
.dropdown {
float: left;
overflow: hidden;
}
.dropdown .dropbtn {
font-size: 16px;
border: none;
outline: none;
color: white;
padding: 14px 16px;
background-color: inherit;
font-family: inherit;
margin: 0;
}
.navbar a:hover,.dropdown:hover .dropbtn {
background-color: #ea8013;
}
.dropdown-content {
display: none;
position: fixed;
background-color: #333;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0.2);
z-index: 1;
}
.dropdown-content a {
float: none;
color: white;
padding: 12px 16px;
text-decoration: none;
display: block;
text-align: left;
}
.dropdown-content a:hover {
background-color: #94a25c;
}
.dropdown:hover .dropdown-content {
display: block;
}
/* The sticky class*/
.sticky {
position: fixed;
top: 0;
width: 100%;
}
.sticky + .content {
padding-top: 0px;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<!---------------------------------------------------Header--------------------------------------------------->
<div class='headBG posRel' id='home'>
<div class='pTop-4 pLeft-10'>
<img class='floatLeft roundedBorader' src='https://pbs.twimg.com/media/EaZSuXXXkAAMtJ5?format=jpg&name=360x360' height="150" width="150"/>
<div class='centerHeadLine pLeft-25'>
<h1 class='b'>Welcome friends</h1>
<h5 class='b'><u>The spot where we test some html,css and js</u></h5>
</div>
</div>
<!--NAV-->
<div class="navbar fitWidth" id="navbar">
<a class="active" href="#home">Home</a>
<a class="" href="#news">News</a>
<a class="" href="#products">Products</a>
<a class="" href="#services">Services</a>
<a class="" href="#customers">Customers</a>
<a class="" href="#community">Community</a>
<a class="" href="#contact">Contact</a>
<div class="dropdown">
<button class="dropbtn">About
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<!-- //TODO: Modals als POP up einbauen,mit jeweiligen content -->
<a href="#">Link 1</a>
<a href="#">Link 2</a>
<a href="#">Link 3</a>
</div>
</div>
</div>
</div>
<!---------------------------------------------------Content-------------------------------------------------->
<div class='contentBody'>
<!--News-->
<div class='news' id="news">
<h1 class='a centerText pTop-5 mTop-5'>News</h1>
<h5 class='a centerText'>Stay tunned with our News</h5>
<div class='alignBox'>
<div class='leftBox50 alignBox roundedBox'>
<div class='centerText'>
<h4>Lorem ipsum</h4>
<p>Lorem ipsum dolor sit amet,consetetur sadipscing elitr,sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat,sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren,no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
</div>
</div>
<div class='rightBox50 alignBox roundedBox'>
<div class='centerText'>
<h4>Lorem ipsum</h4>
<p>Lorem ipsum dolor sit amet,no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
</div>
</div>
</div>
<div class='alignBox pAll-20' id=''>
<form action="/action_page.php">
<label class='white' for="lname">Newsletter:</label>
<input type="text" id="lname" name="lname">
<input type="submit" value="Submit">
</form>
</div>
</div>
<!--//News-->
<!--Products-->
<div class='products' id='products'>
<h1 class='centerText pTop-6 mTop-5'>Products</h1>
<h5 class='b centerText'>Stay tunned with our products</h5>
<div class='leftText pAll-20'>
<h4>Lorem ipsum</h4>
<p>Lorem ipsum dolor sit amet,no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
</div>
<div class='pAll-20'>
<div class='white pBox1 bgLightGreyX'>
<img class='pTop-5' src='https://via.placeholder.com/150'/><br>
<p>Product #1</p>
</div>
<div class='white pBox1 bgLightGreyX'>
<img class='pTop-5' src='https://via.placeholder.com/150'/><br>
<p>Product #2</p>
</div>
<div class='white pBox1 bgLightGreyX'>
<img class='pTop-5' src='https://via.placeholder.com/150'/><br>
<p>Product #3</p>
</div>
<div class='white pBox1 bgLightGreyX'>
<img class='pTop-5' src='https://via.placeholder.com/150'/><br>
<p class='black'>Product #4</p>
</div>
</div>
<div class='pTop-10 pLR'>
<p>Lorem ipsum dolor sit amet,no sea takimata sanctus e</p>
</div>
</div>
<!--//Products-->
<!--Services-->
<div class='services' id='services'>
<h1 class='centerText pTop-5 mTop-5'>tile#1</h1>
<h5 class='b centerText'>Stay tunned with our Services</h5>
<div class='pLeft-5 fitContBoxLeft roundedBox'>
<img class='floatLeft' src='https://via.placeholder.com/50'/><br>
<div class='floatLeft pLeft-5'>tile#2</div>
</div>
<div class='pRight-5 fitContBoxRight roundedBox'>
<img class='floatRight' src='https://via.placeholder.com/50'/><br>
<div class='floatRight pRight-5'>tile#3</div>
</div>
<div class='pLeft-5 fitContBoxLeft roundedBox'>
<img class='floatLeft' src='https://via.placeholder.com/50'/><br>
<div class='floatLeft pLeft-5'>tile#4</div>
</div>
<div class='pRight-5 fitContBoxRight roundedBox'>
<img class='floatRight' src='https://via.placeholder.com/50'/><br>
<div class='floatRight pRight-5'>tile#5</div>
</div>
<h4 class='centerText pTop-5'>asdfadsf asdf asdf asd f asdfvices</h4>
<div class=''></div>
</div>
<!--//Services-->
<!--Customers-->
<div class='customers' id='customers'>
<h1 class='a centerText'>Customers</h1>
<div class=''></div>
<div class=''></div>
<p>jgfjhgfghjf</p>
</div>
<!--//Customers-->
<!--Community-->
<div class='' id='Community'>
<h1 class='a centerText'>Community</h1>
<div class=''></div>
<div class=''></div>
</div>
<!--//Community-->
<!--Contact-->
<div class='' id='Contact'>
<h1 class='a centerText'>Contact</h1>
<div class=''></div>
<div class=''></div>
</div>
<!--//Contact-->
<!--About-->
<div class='aboutUs'>
<div></div>
</div>
<!--//About-->
</>
<!---------------------------------------------------Footer--------------------------------------------------->
<div class='footerBox'>
<div></div>
</div>,
当您使用position: fixed;变换元素时，该元素停止发生。因此，您需要弥补导航栏不再占用的高度不足。
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