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JS Event 3

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First, loading--(Used to load files located on a Web page, not local) example: 
<!DOCTYPE HTML><HTMLLang= "en"><Head>    <MetaCharSet= "UTF-8">    <title>Document</title></Head><Body>    <DivID= "Div1">Loading ...<spanID= "Span1">0%</span></Div></Body><Scripttype= "Text/javascript">    vararr=["http://h.hiphotos.baidu.com/image/pic/item/00e93901213fb80e6c1c307635d12f2eb8389445.jpg","http://e.hiphotos.baidu.com/image/pic/item/5882b2b7d0a20cf4d51141c275094b36acaf992e.jpg","http://f.hiphotos.baidu.com/image/pic/item/d62a6059252dd42aedabbeb6003b5bb5c9eab809.jpg"]; varDiv1=document.getElementById ("Div1"); varSpan1=document.getElementById ("Span1"); varIMGs=[]; varIndex=0;  for (varI=0; I<arr.length; I++){        varimgobj=NewImage (); IMGOBJ.SRC=Arr[i]; Imgobj.onload=function() {index++; Span1.innerhtml=parseint (Index/arr.length*100) + "%";Imgs.push ( This); if(Index==arr.length) {                //load all finisheddiv1.innerhtml="";  for (varJ=0; J<Arr.length; J++) {div1.appendchild (imgs[j]); }            }        }    }</Script></HTML>
    • Domcontentloaded: equivalent to onload
Second, read--window.onload load faster than HTML parts
    • Window.onload:html,css,image,js, audio, flash
    • Read:dom,css
Iii. Commission of events
    • E.target: Triggered object, ul1 for object
    • E.target.tagname: Gets the event source, the tag name of the triggered object, and the label for the UL1
    • Compatible:
      • E.target: for advanced browsers
      • E.srcelement: For low-level browsers
iv. Communication of parameters
    • Method one (most primitive)
    • Method Two
    • Method Three
    • Method Four (high-end practical)

JS Event 3

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