jquery - 切换事件忽略 if($(window).height() > 800){

Question

我创建了一个切换事件，它只在屏幕高度高于 800 时起作用。问题是它甚至在屏幕高度低于 800 时起作用，例如 1000、1200 等等。为什么忽略高度？

想法是，对于滚动事件，svg 路径和切换按钮应该在低于 800 时更改颜色，并在高于 800 时更改颜色。但是当有人点击切换按钮并且用户高于 800 时，单击事件还应更改 svg 路径的颜色，并在再次单击切换时切换为黑色并返回白色。但是点击事件应该只在屏幕高于 800 时起作用。因为低于 800 滚动事件正在做他的工作。

$(function() {
  $(window).scroll(function() {
    if ($(this).scrollTop() > 800) {
      $('.logoColor').addClass('changeColor')
      $('.toggle').addClass('changeToggle')
    }
    
    if ($(this).scrollTop() < 800) {
      $('.logoColor').removeClass('changeColor')
      $('.toggle').removeClass('changeToggle')
    }
  });

});
$(function(){
    $('.toggle').click(function(){
          if($(window).innerHeight() > 700){
                $('.toggle').toggleClass("changeToggle");
        }
    });
});

.section{
      background-color: red;
    }
      .sectiontwo{
      background-color: green;
    }

.logoColor {
  fill: white;
  transition: all ease-in .3s;
}
.toggle {
  background-color: white;
  transition: all ease-in .3s;
  float: right;
}

.changeColor {
  fill: black;
}
.changeToggle{
  background-color: black;
}

svg {
    position: fixed;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<header style="position: fixed;width: 360px;padding-right: 60px;padding-left: 60px;">
    <svg width="101px" height="39px" viewBox="0 0 101 39" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
        <g id="Website" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
            <g id="Home-Desktop" transform="translate(-60.000000, -11.000000)">
                <g id="Menu">
                    <g id="Logo" transform="translate(60.000000, 10.000000)">
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    <div class="toggle" style="height: 40px;width: 40px;"></div>
  </header>
<div class="section" style="height: 800px;"></div>
<div class="sectiontwo" style="height: 800px;"></div>

Answer 1

看这个例子，$(document).height()会返回1016，body背景也会改变，而$(window).height () 将返回 199 并且什么也不会发生。

点击 a 元素自己试一试。

因此，如果你想依赖于用户的屏幕大小，请使用 $(window).height()，如果你想依赖于实际文档或页面大小，请使用 $(document ).height() .

    $('.toggle1').click(function(){
      console.log($(document).height());
      if(parseInt($(document).height()) > 700){
         $('body').toggleClass("changeToggle");
      }
    });
    
    $('.toggle2').click(function(){
      console.log($(window).height());
      if(parseInt($(window).height()) > 700){
         $('body').toggleClass("changeToggle");
      }
    });

body{
height:1000px;
}

.toggle1{
position:fixed;
cursor:pointer;
left:15px;
}

.toggle2{
position:fixed;
cursor:pointer;
right:15px;
}

.changeToggle{
background:#888;
color:#fff;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<a class="toggle1">$(document).height() CLICK ME</a>
<a class="toggle2">$(window).height() CLICK ME</a>