测试是否支持DOMAttrModified

如果不支持propertychange事件,就使用这个,或者更高端的MutationObserver.

var root = document.documentElement

 supportDOMAttrModified = root.addEventListener ?
  ( function () {
    var fn,  f = false , id = root.id;
    fn = function () {
      root.removeEventListener( 'DOMAttrModified' , fn, false );
      supportDOMAttrModified = true ;
      root.id = id; //还原它
    };
    root.addEventListener( 'DOMAttrModified' , fn, false );
    root.id = 'mass' ; //更新属性
    f = root.id != 'mass' ;
    root.id = id; //无论如何也还原它
    return f;
  })() :
  false

 

 

标签:  javascript