console.log(top) 为什么总是0？？获取不到高度
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>JS实战</title> <link rel="stylesheet" type="text/css" href="./css/index.css" /> <link rel="stylesheet" type="text/css" href="./css/base.css" /> <link rel="stylesheet" type="text/css" href="./css/animate.css" /> </head> <body> <!-- 头部 --> <header> <div class="header__logo">H5实战页面</div> <div class="header__nava"> <!-- 导航项 --> <a href="javascript:;" class="header__nava-item header__nava-item_custom_ative">实战课程</a> <a href="javascript:;" class="header__nava-item">商业案例</a> <a href="javascript:;" class="header__nava-item">课程体系</a> <a href="javascript:;" class="header__nava-item">集成环境</a> <a href="javascript:;" class="header__nava-item">云端学习</a> <!-- 导航项按钮 --> <a href="javascript:;" class="header__nava-item header__nava-item_custom_buttom">即刻学习</a> </div> </header> <!-- 屏幕1 --> <div class="screen1"> <!-- 屏幕1标题1 --> <h2 class="screen1__heading">实战课程重磅上线</h2> <!-- 屏幕2标题2 --> <h4 class="screen1__subheading">一键云学习，还在等什么？</h4> </div> <!-- 屏幕2 --> <div class="screen2"> <!-- 网页内容容器 --> <div class="screen__wrap"> <!-- 屏幕2标题1 --> <h2 class="screen2__wrap__heading">每门课都是真实商业案例</h2> <div class="screen2__wrap__heading__line"></div> <!-- 屏幕2标题2 --> <h5 class="screen2__wrap__subheading">真实案例，真实场景,在实战中实践、操作调试<br>大牛带你体验BAT真实开发流程，所有开发过程一一为你呈现</h5> <!-- 屏幕2图片项 --> <div class="screen2__warp_img-item"> <div class="screen2__wrap__img-item__bg-1"></div> <div class="screen2__wrap__img-item__bg-2"></div> <div class="screen2__wrap__img-item__bg-3"></div> </div> </div> </div> <!-- 屏幕3 --> <div class="screen3"> <!-- 容器 --> <div class="screen__wrap"> <!-- 屏幕3图片 --> <div class="screen3__img__bg-1"></div> <!-- 屏幕3标题1 --> <h2 class="screen3__heding">强大的语言课程体系支持</h2> <div class="screen3__heading__line"></div> <!-- 屏幕3标题2 --> <h3 class="screen3__subheding">学习环境与课程轻松对接，安装、调试、写入、部署、运行，一站式解决<br>，让你体验开发流程</h3> <div class="screen3__inner"> <div class="screen3__inner-1">HTML5</div> <div class="screen3__inner-2">PHP</div> <div class="screen3__inner-3">JAVA</div> <div class="screen3__inner-4">Python</div> <div class="screen3__inner-5">Node.JS</div> </div> </div> </div> <!-- 屏幕4 --> <div class="screen4"> <div class="screen__wrap"> <h2 class="screen4__wrap__heading">省去本地复杂的环境搭建</h2> <div class="screen4__wrap__heading__line"></div> <h3 class="screen4__wrap__subheading">你可以告别在虚拟机中调试开发了</h3> <div class="screen4__wrap__img"> <div class="screen4__wrap__img__bg-1"></div> <div class="screen4__wrap__img__bg-2"></div> <div class="screen4__wrap__img__bg-3"></div> <div class="screen4__wrap__img__bg-4"></div> <h4 class="screen4__wrap__img__bg-1__inner-1">实战课程集成开发环境</h4> <h4 class="screen4__wrap__img__bg-2__inner-2">内置终端命令行</h4> <h4 class="screen4__wrap__img__bg-3__inner-3">编译你的应用程序</h4> <h4 class="screen4__wrap__img__bg-4__inner-4">通过云端服务输出效果</h4> </div> </div> </div> <!-- 屏幕5 --> <div class="screen5"> <div class="screen__wrap"> <div class="screen5__wrap__img__bg-1"></div> <h2 class="screen5__wrap__heading">云端学习可以这样简单</h2> <div class="screen5__wrap__heading__line"></div> <h3 class="screen5__wrap__subheading">看视频，敲代码一气呵成。结合慕课网为你提供的云端学习工具，所见即所得。从此学习不一样</h3> </div> </div> <!-- 屏幕6 --> <div class="screen6"> <a href="javascript:;" class="screen6__bottom">继续了解学习体验</a> </div> </div> <!-- 页脚 --> <footer> <div class="screen__wrap"> <div class="footer__heading"> <a href="javascript:;">首页网站</a> <a href="javascript:;">人才招聘</a> <a href="javascript:;">联系我们</a> <a href="javascript:;">高校联盟</a> <a href="javascript:;">关于我们</a> <a href="javascript:;">讲师招募</a> <a href="javascript:;">意见反馈</a> <a href="javascript:;">友情链接</a> </div> <div class="footer__subheading"> <p>copyright ©2015 imooc.com All Rights Reserved | 京ICP备 13046642号-2</p> </div> </div> </footer> <div class="outline"> <a href="javascript:;" class="outline__item">实</a> <a href="javascript:;" class="outline__item">商</a> <a href="javascript:;" class="outline__item">课</a> <a href="javascript:;" class="outline__item">集</a> <a href="javascript:;" class="outline__item">云</a> </div> <script src="./JS/index.js"></script> </body> </html>
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bottom: 120px;
right: 0;
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opacity: 0;
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.screen2__wrap__heading__line_animate_done,
.screen2__wrap__subheading_animate_done,
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opacity: 0;
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opacity: 0;
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transform: translate(0,0);
opacity: 1;
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transform: scale(0);
opacity: 0;
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.screen4__wrap__img__bg-3_animate_done,
.screen4__wrap__img__bg-4_animate_done{
transform: scale(1);
opacity: 1;
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.screen4__wrap__img__bg-1__inner-1,
.screen4__wrap__img__bg-2__inner-2,
.screen4__wrap__img__bg-3__inner-3,
.screen4__wrap__img__bg-4__inner-4{
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opacity: 1;
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transition: all 1s ;
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transition: all 1.2s .3s;
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.screen5__wrap__heading__line_animate_init,
.screen5__wrap__subheading_animate_init{
transform: translate(0,100%);
opacity: 0;
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.screen5__wrap__heading_animate_done,
.screen5__wrap__heading__line_animate_done,
.screen5__wrap__subheading_animate_done{
transform: translate(0,0);
opacity: 1;
}
.screen5__wrap__img__bg-1{
transition: all .7s;
}
.screen5__wrap__img__bg-1_animate_init{
transform: scale(0);
opacity: 0;
}
.screen5__wrap__img__bg-1_animate_done{
transform: scale(1);
opacity: 1;
}*{
margin:0;
padding:0;
font-size:12px;
font-family: "Microsoft Yahei";
}
a{
text-decoration: none;
}// 获取元素
var getElement =function(selector){
return document.querySelector(selector);
}
// 获取元素素组
var getAllElement =function(selector){
return document.querySelectorAll(selector);
}
// 获取元素样式
var getAttribute =function(element){
return element.getAttribute('class');
}
// 设置元素样式
var setAttribute =function(element,cls){
return element.setAttribute('class',cls);
}
// 添加元素样式
var addcls = function(element,cls){
var basecls=element.getAttribute('class')
if(basecls.indexOf(cls)>-1){
setAttribute('class','basecls'+" "+"cls");
}
}
// 删除元素样式
var delcls= function(element,cls){
var basecls=element.getAttribute('class');
if(basecls.indexOf(cls)>-1){
setAttribute('class',basecls.split(cls).join(' ').replace(/\s+/g,' '));
}
return
}
var screenAnimateElements ={
'.screen1':[
'.screen1__heading',
'.screen1__subheading'
],
'.screen2':[
'.screen2__wrap__heading',
'.screen2__wrap__heading__line',
'.screen2__wrap__subheading',
'.screen2__wrap__img-item__bg-2',
'.screen2__wrap__img-item__bg-3'
],
'.screen3':[
'.screen3__img__bg-1',
'.screen3__heding',
'.screen3__heading__line',
'.screen3__subheding',
'.screen3__inner'
],
'.screen4':[
'.screen4__wrap__heading',
'.screen4__wrap__heading__line',
'.screen4__wrap__subheading',
'.screen4__wrap__img__bg-1',
'.screen4__wrap__img__bg-2',
'.screen4__wrap__img__bg-3',
'.screen4__wrap__img__bg-4',
'.screen4__wrap__img__bg-1__inner-1',
'.screen4__wrap__img__bg-2__inner-2',
'.screen4__wrap__img__bg-3__inner-3',
'.screen4__wrap__img__bg-4__inner-4'
],
'.screen5':[
'.screen5__wrap__img__bg-1',
'.screen5__wrap__heading',
'.screen5__wrap__heading__line',
'.screen5__wrap__subheading'
]
};
var setScreenAnimateInit =function(screencls){
var animateElements=screenAnimateElements[screencls];//获取需要设置动画的元素组
for(var i=0;i<animateElements.length;i++){
var element = document.querySelector(animateElements[i]);//获取需要设置动画的元素
var baseCls = element.getAttribute('class');//获取基础样式名称
element.setAttribute('class',baseCls +' '+animateElements[i].substr(1)+'_animate_init');
}
}
var playsreenAnimateDone =function(screencls){
for(var i=0;i<animateElements.length;i++){
var element = document.querySelector(animateElements[i]);
var baseCls = element.getAttribute('class');
element.setAttribute('class',baseCls.replace('_animate_init','_animate_done'));
}
}
window.onload=function(){
console.log('onload')
for(k in screenAnimateElements){
setScreenAnimateInit(k);
}
}
window.onscroll=function(){
var top=document.body.scrollTop;
console.log(top);
}10
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2回答
同学你好，主要是由于浏览器解析的问题：如下：
（1）对于没有使用doctype声明的页面可以使用document.body.scrollTop获取scollTop的高度。
源码中没有使用doctype声明，所以直接使用document.body.scrollTop即可
（2）对于有使用doctype声明的页面可以使用document.documentElement.scrollTop获取scollTop的高度。
同学的代码中使用了doctype声明，需要使用document.documentElement.scrollTop
推荐同学使用兼容性的语法获取scrollTop的高度。
如果我的回答帮助到了你，欢迎采纳，祝学习愉快~
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