JavaScript dom操作程式碼例項

admin發表於2017-04-15
原文網址 : https://www.softwhy.com/article-7248-1.html
JavaScript

分享一段程式碼例項，它實現了對dom操作的簡單演示功能。

程式碼例項如下:

[HTML] 純文字檢視 複製程式碼執行程式碼
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.softwhy.com/" />
<title>螞蟻部落</title>
<style type="text/css">
h1 {
  float: left;
  margin: 0;
}
h2 {
  height: 45px;
}
#div1 {
  width: 120px;
  height: 50px;
  background-color: red;
  text-align: center;
  line-height: 50px;
  position: relative;
  margin: 0px 0 0 400px;
}
#jump {
  position: fixed;
  margin: 100px 0 0 600px;
  padding: 20px;
  background-color: #fefefe;
  width: 400px;
  height: 260px;
  border: 30px solid #8e8e8e;
  display: none;
  z-index: 40;
}
.bg {
  width: 50px;
  height: 50px;
  background-color: #e1e1e3;
  border: 1px solid #c6c6c6;
  text-align: center;
  line-height: 50px;
  float: left;
  margin: 0 0 10px 3px;
  position: relative;
}
ul {
  list-style: none;
}
#submit, #reset {
  float: left;
  margin-left: 20px;
  width: 70px;
  height: 40px;
  border: 1px solid;
  text-align: center;
  line-height: 40px;
  background-color: #03275b;
  color: #fefefe;
}
#sub {
  position: absolute;
  margin: 0 0 0 95px;
}
.selects {
  float: right;
  margin-right: 20px;
}
#select0 {
  background-color: #bf2424;
  color: #fefefe;
  width: 50px;
  height: 50px;
  border: 1px solid #c6c6c6;
  text-align: center;
  line-height: 50px;
  float: left;
  margin: 0 0 10px 3px;
  position: relative;
}
#select1 {
  background-color: #fbbf00;
  color: #fefefe;
  width: 50px;
  height: 50px;
  border: 1px solid #c6c6c6;
  text-align: center;
  line-height: 50px;
  float: left;
  margin: 0 0 10px 3px;
  position: relative;
}
#select2 {
  background-color: #588cfa;
  color: #fefefe;
  width: 50px;
  height: 50px;
  border: 1px solid #c6c6c6;
  text-align: center;
  line-height: 50px;
  float: left;
  margin: 0 0 10px 3px;
  position: relative;
}
#selectTog0, #selectTog1, #selectTog2 {
  background-color: #605e5e;
  color: #fefefe;
  width: 50px;
  height: 50px;
  border: 1px solid #0d0d0d;
  text-align: center;
  line-height: 50px;
  float: left;
  margin: 0 0 10px 3px;
  position: relative;
}
.title {
  margin-left: 20px;
}
#transform {
  border: 5px dashed #000000;
  height: 300px;
  width: 300px;
  background-color: #fefefe;
  float: left;
  margin-top: 20px;
}
.bgToggle {
  width: 50px;
  height: 50px;
  background-color: #605e5e;
  border: 1px solid #0d0d0d;
  text-align: center;
  line-height: 50px;
  float: left;
  margin: 0 0 10px 3px;
  position: relative;
}
</style>
<script type="text/javascript">
window.onload = function() {
  var oDiv1 = document.getElementById('div1');
  var oDiv2 = document.getElementById('jump');
  var res = document.getElementById('reset');
  var sub = document.getElementById('submit');
  var trans2 = document.getElementById('transform');
 
  res.onclick = function() {
    trans2.style.border = "5px dashed #000000";
    trans2.style.height = "300px";
    trans2.style.width = "300px";
    trans2.style.backgroundColor = "#fefefe";
    trans2.style.float = "left";
    trans2.style.marginTop = "20px";
  }
 
  sub.onclick = function() {
    oDiv2.style.display = "none";
  }
 
  oDiv1.onclick = function() {
    oDiv2.style.display = 'block';
    newLi();
  }
}
 
function newLi() {
  for (var i = 0; i < 9; i++) {
    setLi(i);
  }
}
 
function setLi(thisLi) {
  var currLi = "select" + thisLi;
  document.getElementById(currLi).onmouseover = toggleColor;
  document.getElementById(currLi).onmouseout = changed;
  document.getElementById(currLi).onclick = select;
}
 
function toggleColor(evt) {
  if (evt) {
    var thisLi = evt.target;
  } else {
    var thisLi = window.event.srcElement;
  }
  if (thisLi.className == "bg") {
    thisLi.className = "bgToggle";
  } else if (thisLi.id == "select0") {
    thisLi.id = "selectTog0";
  } else if (thisLi.id == "select1") {
    thisLi.id = "selectTog1";
  } else if (thisLi.id == "select2") {
    thisLi.id = "selectTog2";
  } else {
    thisLi.className = "bgToggle";
  }
}
 
function changed(evt) {
  if (evt) {
    var thisLi = evt.target;
  } else {
    var thisLi = window.event.srcElement;
  }
 
  if (thisLi.id == "selectTog0") {
    thisLi.id = "select0";
  } else if (thisLi.id == "selectTog1") {
    thisLi.id = "select1";
  } else if (thisLi.id == "selectTog2") {
    thisLi.id = "select2";
  } else {
    thisLi.className = "bg";
  }
}
 
function select(evt) {
  if (evt) {
    var thisLi = evt.target;
  } else {
    var thisLi = window.event.srcElement;
  }
  var trans = document.getElementById('transform');
 
  if (thisLi.parentNode.id == "ul2") {
    trans.style.width = thisLi.value;
  }
  if (thisLi.parentNode.id == "ul3") {
    trans.style.height = thisLi.value;
  }
  if (thisLi.id == "selectTog0") {
    trans.style.backgroundColor = "#bf2424";
  }
  if (thisLi.id == "selectTog1") {
 
    trans.style.backgroundColor = "#fbbf00";
  }
  if (thisLi.id == "selectTog2") {
    trans.style.backgroundColor = "#588cfa";
  }
}
</script>
</head>
<body>
  <h1>請為下面的DIV設定樣式：</h1>
  <div id="div1" tltle="點選設定">點選設定</div>
  <div id="transform"></div>
  <div id="jump">
    <div class="selects">
      <ul id="ul1">
        <li id="select0">紅</li>
        <li id="select1">黃</li>
        <li id="select2">藍</li>
      </ul>
      <ul id="ul2">
        <li class="bg" id="select3" value="200">200</li>
        <li class="bg" id="select4" value="300">300</li>
        <li class="bg" id="select5" value="400">400</li>
      </ul>
      <ul id="ul3">
        <li class="bg" id="select6" value="200">200</li>
        <li class="bg" id="select7" value="300">300</li>
        <li class="bg" id="select8" value="400">400</li>
      </ul>
    </div>
    <div class="title">
      <h2 id="h5-1">選擇背景顏色：</h2>
      <h2 id="h5-2">選擇寬度(PX)：</h2>
      <h2 id="h5-1">選擇高度(PX)：</h2>
    </div>
    <div id="sub">
      <div id="reset" title="重置">重置</div>
      <div id="submit" title="確定">確定</div>
    </div>
  </div>
</body>
</html>

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