Question

我写了以下法典:

function byId(id) {
  return document.getElementById(id);
}
function addElm(root,elm) {
  document.createElement(elm);
  if(!root) {
      root = document;
  }
  root.appendChild(elm);
  return elm;
}
document.addEventListener( DOMContentLoaded ,function() {
  var elm = byId( myExistingElmId );
  addElm(elm, span );
},false);

The element having id "myExistingElmId" is there in my document. The line

root.appendChild(elm);

• 给我以青春期的以下错误:

Uncaught error: NOT_FOUND_ERR: DOM Exception 8

为什么会发生这种情况?

Answer 1

www.un.org/spanish/ga/president

It should be:

function addElm(root, type) {
  var elm = document.createElement(type);
  if(!root) {
      root = document.body;
  }
  root.appendChild(elm);
  return elm;
}

见。 http://jsfiddle.net/alnitak/wAuvJ/。

[@Ethan is also correct that it should be document.body, but that s incidental to the actual error you were seeing as you weren t exercising that code path]

Answer 2

。如@Alnitak所说,你失去了<编码>文件.createElement的结果。该法典应当发挥作用:

function addElm(root,elm) {
    var elm = document.createElement(elm);
    if(!root) {
        root = document.body;
    }
    root.appendChild(elm);
    return elm;
}

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