MU Lesson jQuery 2018/6/21

Jquery Document: Api.jquery.com

Dom Objects and jquery objects

if (obj.nodetype)  //Detect DOM Object   return 1if (obj.jquery)        //Detect jquery Object   Ruturn jquery version 1.12.4 conversion var jqueryobj=$ (domobj);   $ () package var domobj=jqueryobj.get ([index]);   Get method

Create an HTML element:

var div=$ ("<div>hello</div>");  Create a $ () package for the Html.console.log (DIV);    Output Dom  Divconsole.log ($ ("div"));  The jquery selector is not available and the page is not visible. Div.appendto ("body");   Append to body last face. Console.log ($ ("div"));//The page appears, the jquery selector is selected.

Create/Add Property

var link1=$ (' <a> ', {      text: ' Baidu ',      href: ' http://www.baidu.com ',      target: ' _blank ',      title: ' goto Baidu '}); Link1.appendto (' body ');//The first method is suitable for empty elements. var link2=$ (' <a>baidu</a> '). attr ({      href: ' http://www.baidu.com ',      target: ' _blank ',      title: ' goto Baidu '); Link2.appendto (' body ');
The second use of attr ();

jquery operations

$ (). length; check element [index]   //Extract element, return Domget ([])   //Extract element, return Domget ()   //No index, return array object. Get ( -1)   //take from the last element.  -2,-3 backwards in turn. Undefined occurs across the border. eq (index)   Returns a JQuery object.   

First ()  //One
Last ()   //FINAL

The performance of the method is greater than the filter;

ToArray ()   returns the collection as if it were not a parameter.

　　

　

　

MU Lesson jQuery 2018/6/21