javascript - 如何让一个 div 随着窗口大小的调整而移动，而不会将其他 div 推开？

Question

我花了很长时间试图让它工作。

我有一个名为“RightExtra”的部分和一个名为“RightExtraContent”的 div。我正在努力使这两个 div 可以在窗口调整到某个点时自由移动，而不会影响任何其他 div 的位置。

这是我的意思的直观解释:

http://i.imgur.com/A3qBGsj.png

这是 fiddle :http://jsfiddle.net/c21nzs13/1/

我已经尝试了一堆不同的代码组合，但仍然没有成功。

* {
  padding: 0;
  margin: 0;
}
html {
  background: #1e1e1e;
  /*Back Colors 1*/
}
body {
  background-color: #1e1e1e;
  /*background:url('https://snap-photos.s3.amazonaws.com/img-thumbs/960w/4657039731.jpg');*/
}
a {
  color: #FFFFFF;
  text-decoration: none;
}
a:active,
a:hover {
  text-decoration: underline;
}
.nofancy a {
  text-decoration: none;
}
/*These nofancies don't work*/

.nofancy a:hover {
  text-decoration: none;
}
/*These nofancies don't work*/

#heady {
  text-align: center;
  width: 100%;
  height: 75px;
  background-color: #1e1e1e;
  /*Back Colors 2*/
  font-family: Tahoma;
  font-size: 16px;
  color: #000000;
  position: relative;
  margin-bottom: 30px;
}
#wrapper {
  text-align: center;
  width: 1000px;
  height: 100%;
  margin-left: auto;
  margin-right: auto;
  /*background-color:#1e1e1e;                       Back Colors 3*/
  font-family: Tahoma;
  font-size: 16px;
  position: relative;
}
#RightExtra {
  background-color: none;
  width: 500px;
  float: right;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}
#RightExtraContent {
  font-family: Tahoma;
  font-size: 16px;
  height: 800px;
  width: 300px;
  color: white;
  background-color: #343434;
  text-align: center;
  border-radius: 30px;
  position: fixed;
  float: right;
}
#followfoot {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 180px;
  background-color: none;
  text-align: center;
  /*display:none;*/
}
#mag {
  background-color: #739FE0;
  border-color: #739FE0;
  border-style: solid;
  border-width: 2px;
  border-radius: 20px;
  line-height: 10px;
  text-align: center;
  margin-left: 8px;
  cursor: pointer;
}
#feety {
  text-align: center;
  width: 100%;
  height: 0px;
  //100px background-color:darkslateblue;

  /*Back Colors 4*/
  font-family: Tahoma;
  font-size: 16px;
  color: white;
  position: fixed;
  //Changing this to relative makes followfoot disappear when you scroll long enough.

}
.UpCenter {
  /*background-color:#1e1e1e;                                        Back Colors 5*/
  padding-top: 30px;
  margin-bottom: 50px;
  height: 90px;
}
.SignUp {
  background-color: #ccc;
  border-width: 1px;
  border-color: #ccc;
  border-radius: 10px;
  width: 75px;
  padding: 0px 0px;
  margin-left: 30px;
  text-align: center;
  float: right;
}
/* clearfix */

/**
 * For modern browsers
 * 1. The space content is one way to avoid an Opera bug when the
 *    contenteditable attribute is included anywhere else in the document.
 *    Otherwise it causes space to appear at the top and bottom of elements
 *    that are clearfixed.
 * 2. The use of `table` rather than `block` is only necessary if using
 *    `:before` to contain the top-margins of child elements.
 */

.cf:before,
.cf:after {
  content: " ";
  /* 1 */
  display: table;
  /* 2 */
}
.cf:after {
  clear: both;
}
.cf {
  * zoom: 1;
}
ul.navbar {
  border-style: solid;
  border-width: 1px;
  border-color: #739FE0;
  width: 100px;
  /*Widthchanger1*/
  border-radius: 4px;
  margin-left: 0px;
  margin-right: 0px;
  font-size: 14px;
  height: 33px;
}
ul.navbar li a.ActiveListItem {
  color: white;
  !important;
  background-color: #222 !important;
  padding: 7.5px 0px !important;
  font-weight: normal !important;
  margin-left: 0px;
  /*Widthchanger2, got the activeitem centered with list text this way*/
  margin-right: 0px;
  border-radius: 4px;
  height: 18px;
  width: 100px;
  /*kinda messes with width of text*/
  margin-bottom: 1px;
}
ul.navbar li {
  position: relative;
  width: 100px;
  /*Changes width of actual list*/
}
ul.navbar li a {
  display: block;
  color: white;
  padding: 10px 5px;
  text-decoration: none;
  transition: all .1s ease-in;
}
ul.navbar li a:hover,
ul.navbar li:hover > a {
  /*background:black; */
  background: #739FE0;
  color: #FFFFFF;
  /*font-weight:600;*/
  /*border-bottom-color:#FFFFFF;
    border-bottom-style:solid;*/
  /*border-color:#FFFFFF;
    border-style:solid;
    border-width:1px; */
}
ul.navbar li ul {
  margin-top: 0px;
  /*Controls space from listdropdown to listchooser*/
  position: absolute;
  background: #222;
  font-size: 14px;
  /* min-width: 200px; */
  display: none;
  z-index: 99;
  box-shadow: inset 0 0px 3px rgba(0, 0, 0, .6), 0 5px 10px rgba(0, 0, 0, .6);
}
ol,
ul {
  list-style: outside none none;
}
.hidden {
  display: none;
}
/*Lister*/

form {} .lister input {
  width: 235px;
  /*width of todo input box*/
  height: 33px;
  padding-left: 10px;
  padding-right: 10px;
  border-width: 1px;
  border-style: solid;
  border-color: #739FE0;
  float: left;
  margin-bottom: 20px;
  font-size: 14px;
  font-family: "Tahoma";
  background-color: #222;
  color: white;
}
.lister input:focus {
  outline: none;
  border-color: #739FE0;
  /*ccc*/
  box-shadow: 0px 0px 7px 0px #739FE0;
}
.lister ul {
  /*list-style: square inside;*/
  padding: 10px 0px 55px 0px;
  /* padding for outside area of list*/
  /* This is what's visible when not in use Used to be 10*/
  /*height:50px;*/
  /*background: #0f705d;           DarkerOutsideColor*/
  background: none;
  /*width: 100%;*/
  font-family: "Tahoma";
}
.active {
  text-align: center;
}
.inactive {
  display: none;
}
.lister li {
  font-size: 14px;
  /*font size of list items*/
  /*font-weight: 600;*/
  color: #181818;
  /*Font Color d5faf3*/
  display: inline-block;
  /*This makes the items side-by-side and not columns*/
  padding: 9px;
  margin-bottom: 5px;
  /*SEPARATE*/
  /* float:left; Interferes with text-align of Active*/
}
.lister li:nth-child(odd) {
  background: #343434;
  /*LighterInside Color,Odd*/
  border-color: #ccc;
  border-width: 1px;
  border-radius: 5px;
  border-style: solid;
  box-shadow: 0px 0px 10px 0px #000000;
  color: #ccc;
  /*opacity:0.6;
    filter:alpha(opacity=60);*/
}
.lister li:nth-child(even) {
  background: #343434;
  /*LighterInside Color,Even*/
  border-color: #ccc;
  border-width: 1px;
  border-radius: 5px;
  border-style: solid;
  box-shadow: 0px 0px 10px 0px #000000;
  color: #ccc;
}
.lister li > a {
  /*float: right;*/
  text-decoration: none;
  color: white;
  font-weight: bold;
  /*transition: all .2s ease-in-out;*/
  /*position:relative;*/
  margin-top: 2px;
  display: inline-block;
}
.lister li > a:hover {
  /*font-size: 105%;*/
  /*color: #c0392b;*/
  color: #000000;
}
.lister li > span {
  display: inline-block;
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  max-width: 379px;
}
/*Clearable*/

.clearable {
  /*background: #fff; */
  /*background:url(../images/splusgreen.png); */
  background-repeat: no-repeat;
  background-size: 10px 10px;
  background-position: right 5px center;
  /* -15*/
  transition: background 0.4s;
}
.clearable.x {
  /*background-position: right 5px center;*/
}
.clearable.onX {
  cursor: pointer;
}

<section id="heady">
  <div style="width:1000px;margin-left:auto;margin-right:auto;">
    <div style="text-align: left;padding:25px 0px;display:inline-block;float:left;font-size:18px;"><b><a href="index.html">Calories</a></b>
    </div>
    <div style="text-align: right;padding:25px 00px;display:inline-block;float:right;">
      <!--<a href="profile.html">Home</a> | --> <a href="index.html">Sign In</a> | <a href="index.html">Sign Up</a>
    </div>
  </div>
</section>
<section id="RightExtra">
  <div id="RightExtraContent">Yes hello....!</div>
</section>
<section id="wrapper">
  <br>
  <br>
  <div class="UpCenter">
    <div style="vertical-align:top;display:inline-block;">
      <ul class="navbar cf">
        <li> <a href="#" class="ActiveListItem">Category</a>
          <ul></ul>
        </li>
      </ul>
    </div>
    <div class="lister" style="display:inline-block;vertical-align:top;padding:0px 0px 0px 10px;">
      <form action="">
        <input type="text" class="clearable" placeholder="Add your meals here..." autocomplete="off">
      </form>
    </div>
    <div id="mag" style="display:inline-block;vertical-align:top;">
      <img src="images/magCircy.png" width="33px" height="33px" onClick="changeHeight(this,event);"></img>
    </div>
  </div>
  </div>
</section>
<section id="followfoot"></section>

Answer 1

为了实现这一点，我增加了包装器的宽度并将新的 div 移入其中。