javascript-通过查找输入background-color更改div颜色

如何更改JavaScript代码以找到输入标签的HTML背景颜色,而不必像在此代码段中那样手动将颜色插入JavaScript？

function ChangeColor(color) {
  var clrDiv = document.getElementsByClassName("colorDiv")[0];
  clrDiv.style.backgroundColor = color;
}

document.getElementById("select1").onclick = function() {
  ChangeColor("red");
}
document.getElementById("select2").onclick = function() {
  ChangeColor("green");
}
document.getElementById("select3").onclick = function() {
  ChangeColor("blue");
}

.colorDiv {
  width: 50px;
  height: 50px;
}

<section>
  <input id="select1" name="test" type="radio" />
  <label style="background-color:red;" for="select1">Red</label>
  <input id="select2" name="test" type="radio" />
  <label style="background-color:green;" for="select2">Green</label>
  <input id="select3" name="test" type="radio" />
  <label style="background-color:blue;" for="select3">Blue</label>
</section>
<footer>
  <div class="colorDiv"></div>
</footer>

解决方法:

这是你想要的？我传递颜色而不是颜色,传递选择的ID,找到输入的标签,然后使用该标签的背景色设置div背景色.

如果可以使用jquery,则可以大大简化.

function findLableForControl(el) {
   var idVal = el.id;
   labels = document.getElementsByTagName('label');
   for( var i = 0; i < labels.length; i++ ) {
      if (labels[i].htmlFor == idVal)
           return labels[i];
   }
}

function ChangeColor(color) {
    var clrDiv = document.getElementsByClassName("colorDiv")[0];
    clrDiv.style.backgroundColor = findLableForControl(document.getElementById(color)).style.backgroundColor;;
}

document.getElementById("select1").onclick = function() { ChangeColor("select1"); }
document.getElementById("select2").onclick = function() { ChangeColor("select2"); }
document.getElementById("select3").onclick = function() { ChangeColor("select3"); }

.colorDiv{
	width:50px;
	height:50px;
}

<section>
    <input id="select1" name="test" type="radio" />
        <label style="background-color:red;" for="select1">Red</label>
    <input id="select2" name="test" type="radio" />
        <label style="background-color:green;" for="select2">Green</label>
    <input id="select3" name="test" type="radio" />
        <label style="background-color:blue;" for="select3">Blue</label>
</section>
<footer>
    <div class="colorDiv"></div>
</footer>

标签：html-form,html,javascript
来源： https://codeday.me/bug/20191109/2012618.html