什么是偏移量?

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想要解释一下offsetHeightclientHeightscrollHeightoffsetWidthclientWidthscrollWidth?

function whatis(propType) {
  var mainDiv = document.getElementById("MainDIV");
  if (window.sampleDiv == null) {
    var div = document.createElement("div");
    window.sampleDiv = div;
  }
  div = window.sampleDiv;
  var propTypeWidth = propType.toLowerCase() + "Width";
  var propTypeHeight = propType + "Height";

  var computedStyle = window.getComputedStyle(mainDiv, null);
  var borderLeftWidth = computedStyle.getPropertyValue("border-left-width");
  var borderTopWidth = computedStyle.getPropertyValue("border-top-width");

  div.style.position = "absolute";
  div.style.left = mainDiv.offsetLeft + Math.round(parseFloat((propType == "client") ? borderLeftWidth : 0)) + "px";
  div.style.top = mainDiv.offsetTop + Math.round(parseFloat((propType == "client") ? borderTopWidth : 0)) + "px";
  div.style.height = mainDiv[propTypeHeight] + "px";
  div.style.lineHeight = mainDiv[propTypeHeight] + "px";
  div.style.width = mainDiv[propTypeWidth] + "px";
  div.style.textAlign = "center";
  div.innerHTML = propTypeWidth + " X " + propTypeHeight + "( " +
    mainDiv[propTypeWidth] + " x " + mainDiv[propTypeHeight] + " )";



  div.style.background = "rgba(0,0,255,0.5)";
  document.body.appendChild(div);

}
document.getElementById("offset").onclick = function() {
  whatis('offset');
}
document.getElementById("client").onclick = function() {
  whatis('client');
}
document.getElementById("scroll").onclick = function() {
  whatis('scroll');
}
#MainDIV {
  border: 5px solid red;
}
<button id="offset">offsetHeight & offsetWidth</button>
<button id="client">clientHeight & clientWidth</button>
<button id="scroll">scrollHeight & scrollWidth</button>

<div id="MainDIV" style="margin:auto; height:200px; width:400px; overflow:auto;">
  <div style="height:400px; width:500px; overflow:hidden;">

  </div>
</div>

提问于
用户回答回答于

可以尝试下这个:

<element>                                     
    <!-- *content*: child nodes: -->        | content
    A child node as text node               | of
    <div id="another_child_node"></div>     | the
    ... and I am the 4th child node         | element
</element>                                    

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