jquery Assignment creation element Add class belongs to HTML content (1/4)

1. Selector

In HTML, we can use web effects to select an HTML tag to operate, such as modifying the attributes of HTML tags, adding a class attribute, and so on. Using jquery to select an HTML tag is easier

1 Select an HTML tag through the ID attribute of the HTML

var id = jquery ("#id3");

Id.html ("hahaha");

<div id= "ID3" ></div>

The above code gets a div tag and assigns hahaha to the contents of the tag, because the tag ID equals ID3

2) by element name selection

var ids = jquery ("div");

alert (IDs);

///////////////////////

<div>aa</div>

<div>bb</div>

The above code gets an array of elements in the array that are 2 div tags

3 Select elements through the class attribute of the element

4 through the * can select all elements

5 Select elements through element child elements

For example:

jquery ("Div li"); Get the Li child element below the DIV element

jquery ("Div li:has (a)"); Gets the Li child element below the div element, and these child elements are child elements with <a> tags, such as:<div><li><a>aa</a></li><li> </li></div> only to the first Li

jquery ("Div:eq (0)"); Get the first DIV element

jquery ("Div:lt (2)" >;//Get top two div

jquery ("div:last (0)"); Get the Post div

2. Remove first space

var s = Jquery.trim ("SSS");

3. The role of window.onload = Mybegin is to execute the Mybegin function when the document is loaded, but this sentence can only be written once, and if you want to perform multiple functions, use jquery:

jquery (document). Ready (function () {});

This sentence can also be written as: jquery (function () {});

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