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首页 / 脚本样式 / JavaScript / javascript获取隐藏dom的宽高 具体实现

首先clone一个DOM,设置position:absolute,然后设置top为一个比较大的负值,然后使其显示出来,最后获取到了DOM的宽高后,将其remove。
具体代码如下:
Js代码
复制代码 代码如下:
function getCss(elem, css){ 
 if (window.getComputedStyle) { 
  return window.getComputedStyle(elem, null)[css]; 
 }else if (elem.currentStyle) { 
  return elem.currentStyle[css]; 
 }else { 
  return elem.style[css]; 
 } 

function getWH(dom){ 
 var get = function(elem){ 
  var wh = {}; 
  "Width Height".replace(/[^ ]+/g, function(i){ 
   var a = i.toLowerCase(); 
   wh[a] = elem["offset" + i] || elem["client" + i]; 
  }); 
  return wh; 
 }; 
 if (getCss(dom, "display") === "none") { 
  var nDom = dom.cloneNode(true); 
  nDom.style.position = "absolute"; 
  nDom.style.top = "-3000px"; 
  nDom.style.display = "block"; 
  document.getElementsByTagName("body")[0].appendChild(nDom); 
  var wh = get(nDom); 
  nDom.parentNode.removeChild(nDom); 
  return wh; 
 }  
 return get(dom); 

//test  
console.log(getWH(document.getElementById("content"))); 
var domA = document.createElement("a"), _ostyle = "position:absolute;z-index:999999;width:92px;height:22px;position:absolute;display:none;"; 
domA.setAttribute("style", _ostyle); 
domA.style.cssText = _ostyle; 
domA.setAttribute("href", "javascript:void(0);"); 
document.getElementsByTagName("body")[0].appendChild(o); 
console.log(getWH(domA));
function getCss(elem, css){
 if (window.getComputedStyle) {
  return window.getComputedStyle(elem, null)[css];
 }else if (elem.currentStyle) {
  return elem.currentStyle[css];
 }else {
  return elem.style[css];
 }
}
function getWH(dom){
 var get = function(elem){
  var wh = {};
  "Width Height".replace(/[^ ]+/g, function(i){
   var a = i.toLowerCase();
   wh[a] = elem["offset" + i] || elem["client" + i];
  });
  return wh;
 };
 if (getCss(dom, "display") === "none") {
  var nDom = dom.cloneNode(true);
  nDom.style.position = "absolute";
  nDom.style.top = "-3000px";
  nDom.style.display = "block";
  document.getElementsByTagName("body")[0].appendChild(nDom);
  var wh = get(nDom);
  nDom.parentNode.removeChild(nDom);
  return wh;
 }
 return get(dom);
}
//test
console.log(getWH(document.getElementById("content")));
var domA = document.createElement("a"), _ostyle = "position:absolute;z-index:999999;width:92px;height:22px;position:absolute;display:none;";
domA.setAttribute("style", _ostyle);
domA.style.cssText = _ostyle;
domA.setAttribute("href", "javascript:void(0);");
document.getElementsByTagName("body")[0].appendChild(o);
console.log(getWH(domA));

还有其他更好的方法欢迎提出来。