Summary of common js Methods

Val (), append (), get (), split (), substr (), each (), html (), keyup (), trim (), show (), hide (), indexOf ()
One by one:
Val (): To evaluate and assign values to a page element.
Value: var result = $ ("# txtSearch"). val ();
Value assignment: $ ("# txtSearch"). val (result );

Each (): calls the following methods for Each element in a set for operations on a set, for example:
$. Each (data. list, function (I, item ){
Alert (item ["WikiTitle"] "+" item ["WikiID"]); // I is the following table of elements in the set. item represents the element itself.
});

Append (): Append an element to the specified page Element
For example, a list element <li> test! </Li>. Page elements like this can be dynamically added using the append method. For example:
The page contains a div with id = "div_keycontent": <div id = "div_keycontent"> </div>
In Js, you can write as follows:
$. Each (data. list, function (I, item ){
$ ("# Div_keycontent "). append ("<li>" + item ["WikiTitle"] + "<a href = \" Read/"+ item [" WikiID "] +" \ "> View </ a> "+" </li> ");
});

Get (): Get Data asynchronously on the page. This method is in the form of asynchronous binding. I have explained it in my previous article. I will not talk about it here.

Spilt (): perform the following operations on strings:
Var str = spit ("liu, ming, feng ",",");
The returned str is a string array: {"liu", "ming", "feng "}

Substr (); for string operations, remove the sub-string
Usage:
/// Determine whether the last character is a comma
If (str. substring (str. length-1, str. length) = "," | str. substring (str. length-1, str. length) = ","){
Alert ("the last character is a comma !");
}

Html (): modify the content of an html Tag, for example:
$ ("# Div_keycontent" pai.html ("<p> no data </p> ");

Keyup (); trigger by pressing the keyboard
$ ("# TxtSearchKey"). keyup (function (){
$ ("# Div_keycontent" pai.html ("<p> data retrieval... </p> ");
});

Trim (): removes spaces at the beginning and end of a string.
Usage: str. trim ();

Show (): Display page elements, for example, $ ("# txtSearchKey"). show ();
Hide (): Hiding page elements such as: $ ("# txtSearchKey"). hide ();

Indexof (): Check whether the corresponding substring exists in the string.
Usage:
If (str. indexOf (',,')! =-1 | str. indexOf (',,')! =-1) {// determines whether a comma exists.
Alert ("two commas are used together !");
}