The test is as follows:
Array type testObject Type TestInstantiating a function testfunction parameter pass test by address
<textarea class="my_show_textarea" id="my_show_textarea">var a=b=[1,2]; A.push (3); Alert (a.length+ ': ' +b.length); </textarea>
About the impact on node object operations:
Since the function is passed by value, the node is referenced by the node itself rather than one of its clones when the node is inserted, so the nodes are shifted
Such as:
<textarea id="runcode56586"><! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> <ptml xmlns=" http://www.w3.org/1999/xhtml "> <pead> <meta http-equiv=" Content-type "content=" text/html; charset=gb2312 "/> <title> Untitled document </title> <style type=" Text/css ">. c2{border:1px solid #ccc; width:100px; height:100px;} . c1{border:2px Solid #000; width:50px; height:60px;} </style> </pead> <body> <div class= "C1" id= "Div1" >div1</div> <div class= "C2" id= "Div2" ">div2</div> <input type=" button "value=" Append Div1 to Div2 "id=" button "/> <script" type= Ascript "> function $ (elem) {return document.getElementById (elem);} var div1=$ ("Div1"); var div2=$ ("Div2"); var button=$ ("button"); Button.onclick=function () {div2.appendchild (DIV1); }; </script> </body> </ptml></textarea>
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The last one is about the removal of the node, originally thought to use innerhtml= "" To remove element content, in IE will be created in the node from memory completely eliminated, the fact is not so, but produced a very strange phenomenon:
Such as:
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> <ptml xmlns=" http://www.w3.org/1999/xhtml "> <pead> <meta http-equiv=" Content-type "content=" text/html; charset=gb2312 "/> <title> Untitled document </title> <style type=" Text/css "> body{font-family:" Microsoft Ya-hei "," Times New Roman ", Times, serif; font-size:12px;} . c2{border:1px Solid #ccc; width:500px; height:150px;} . c1{border:2px Solid #000; width:300px; height:100px;} . c3{border:1px Solid #ccc; width:100px; height:50px;} </style> </pead> <body> <p> back and forth repeatedly click Add_div and inner to try, will find strange phenomenon. Click Alert and you will find that the div you created is not purged from memory. Using the RemoveChild method will be very normal performance </p> <div id= "div2" class= "C2" ></div> <input type= "button" value= "Add_div" /> <input type= "button" value= "inner"/> <input type= "button" value= "Remove"/> <input type= "button" value= "alert"/> <script type= "Text/javascript"> if (!+" \v1 ") {}else alert (" Please test in IE "); var elem=document.createelement ("div"); Elem.classname= "C1"; Elem.innerhtml= "Creatediv C1"; var elem2=document.createelement ("div"); Elem2.classname= "C3"; Elem2.innerhtml= "Creatediv C3"; Elem.appendchild (ELEM2); var Div2=document.getelementbyid ("Div2"); var inputs=document.getelementsbytagname ("input"); Inputs[0].onclick=function () {div2.appendchild (elem);}; Inputs[1].onclick=function () {div2.innerhtml= ""}; Inputs[2].onclick=function () {Div2.removechild (elem)}; Inputs[3].onclick=function () {alert (ELEM+ELEM2)}; </script> </body> </ptml>
[Ctrl + A All SELECT Note: If the need to introduce external JS need to refresh to perform]
