Common JS methods (DOM operations)

 

<Select name = "select" size = "1" class = "lianjie" onChange = "window. open (this. options [this. selectedIndex]. value, '_ blank') "style =" background: # fd8a29 ">
<Option value = ""> Jiangxi Provincial university ideological and political network link </option>
<Option value = "http://www.jxmu.edu.cn"> shengde net, School of Medicine, Nanchang University </option>
<Option value = "http://www.qzjci.com"> Jingdezhen Emy of ceramics Truth Network </option>
<Option value = "http://www.md.jxufe.cn/"> Mingde network, Jiangxi University of Finance and Economics </option>
<Option value = "http://www.ecjtu.net/"> sun xinnet of East China Jiaotong University </option>
<Option value = "http://qh.nchu.jx.cn/"> Nanchang Institute of Aeronautics and Astronautics </option>
</Select>

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JS timed refresh page:

<Script language = "javascript">
Function myrefresh ()
{
Window. location. href = "login. aspx ";
}
SetTimeout (myrefresh, 2000); // refresh once in 2 seconds
</Script>

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Function: Split ()
Function: uses a specified separator to split a string and store it in an array.
Example:

 

Str = "jpg | bmp | gif | ico | png ";
Arr = theString. split ("| ");
// Arr is an array containing character values "jpg", "bmp", "gif", "ico", and "png"

Function: Join ()
Function: combines an array into a string using the separator you selected.
Example:

Var delimitedString = myArray. join (delimiter );
Var myList = new Array ("jpg", "bmp", "gif", "ico", "png ");
Var portableList = myList. join ("| ");
// The result is jpg | bmp | gif | ico | png.

Function: substring ()
Function: String truncation. For example, substring () is used to obtain "minidx" from "minidxsearchengine)

 

Function: indexof ()
Function: returns the subscript of the first character matching the substring in a string.

Var myString = "JavaScript ";
Var w = myString. indexOf ("v"); w will be 2
Var x = myString. indexOf ("S"); x will be 4
Var y = myString. indexOf ("Script"); y will also be 4
Var z = myString. indexOf ("key"); z will be-1

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OBJ. Innerhtml,OBJ. Outerhtml

If <Div id = "Container"> <a herf = http://www.baidu.com> Baidu </a> </div>

----> Var OBJ = Get. elementbyid ("Container ")
OBJ. innerhtml is equal to <a herf = http://www.baidu.com> Baidu </a>

You can delete yourself when obj. outerhtml = "" is set in Js. In other words, you can delete an object node by setting the object's outerhtml attribute value.

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JS object change event:
Eg.

<Script type = "text/ecmascript" language = "javascript">
Function fn1 ()
{
Alert ("events before change! ");
}
Function fn2 ()
{
Alert ("changed events! ");
}
Function changClick ()
{
Var iptChk = document. getElementById ("iptChk ");
IptChk. onclick = fn2;
}
</SCRIPT>

<Div> <input type = "checkbox" id = "iptchk" value = "123456" onclick = "fn1 ();"/> </div>

<Br/>
<A onclick = "changclick ();" style = "cursor: pointer;"> change event </a>

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// Recommend the website address to a friend

Function copytoclipboard ()
{
VaR clipboardcontent = '';
Clipboardcontent + = Document. title;
Clipboardcontent + = Window. Location. href;
Window. clipboardData. setdata ("text", clipboardcontent );
Alert ("You have copied the link and the title. You can paste it to QQ, Popo, MSN, and so on to share it with your friends! ");
}