Some common methods of JS Summary _ basic knowledge

Source: Internet
Author: User
Tags ming

Val (), append (), get (), Split (), substr (), each (), HTML (), KeyUp (), Trim (), show (), Hide (), indexOf ()
One by one:
Val (): To take a value and assign a page element
Value: var result = $ ("#txtSearch"). Val ();
Assignment: $ ("#txtSearch"). Val (result);

Each (): the operation of a set, followed by a method call to each element within the collection, for example:
$.each (data.list, function (I, item) {
Alert (item["Wikititle"] "+" item["wikiid");//i is the element of the collection. The following table, item represents the element itself

Append (): Append elements after the specified page element
For example, a list element <li>test!</li&gt, a page element like this can dynamically add multiple <li> items through append methods such as:
The page has a id= "div_keycontent" div: <div id= "Div_keycontent" ></div>
JS inside can be written like this:
$.each (data.list, function (I, item) {
$ ("#div_keycontent"). Append ("<li>" + item["Wikititle"] + "<a href=\" read/"+ item[" wikiid "] +" \ "> View </a& gt; "+" </li> ");

Get (): On the page asynchronously fetch data, this way is the form of asynchronous binding, in my previous article has confessed, here will not say it.

Spilt (): Manipulating Strings for example:
Var str = Spit ("Liu,ming,feng", ",");
This returned STR is an array of strings: {"Liu", "Ming", "Feng"}

Substr (); string manipulation, going inside the substring
Determines 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 (): Modifies the contents of an HTML label, for example:
$ ("#div_keycontent"). HTML ("<p> no Data </p>");

Keyup (); the keyboard presses the Bouncing Trigger method
$ ("#txtSearchKey"). KeyUp (function () {
$ ("#div_keycontent"). HTML ("<p> ....</p> in Data Retrieval");

Trim (): Remove the trailing space of the string
Usage: Str.trim ();

Show (): Let the page element display for example: $ ("#txtSearchKey"). Shows ();
Hide (): Hides the elements of a page for example: $ ("#txtSearchKey"). Hide ();

Indexof (): see if there is a substring in the string
if (Str.indexof (',,, ')!=-1 | | str.indexof (',,, ')!=-1) {///Determine whether there are even commas
Alert ("With two commas!") ”);

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