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Enhanced basic selector [selector_3.html]

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Author: User
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Enhanced basic selector [selector_3.html]
$ ("ul Li:first")
$ ("ul Li:last")
$ ("Table Tr:even")
$ ("Table tr:odd")
$ ("Table Tr:eq (0)")
$ ("Table tr:gt (0)")
$ ("Table Tr:lt (2)")
$ (": Header")
$ (": Checkbox:not (: Checked)") Select all unchecked check boxes.

1 <HTML>2   <Head>3     <Metahttp-equiv= "Content-type"content= "text/html; charset=utf-8">4     <Scripttype= "Text/javascript"src=".. /js/jquery-1.8.2.js "></Script>5   </Head>6   <Body>7     <ul>8         <Li>List Item 1</Li>9         <Li>List Item 2</Li>Ten         <Li>List Item 3</Li> One         <Li>List Item 4</Li> A         <Li>List Item 5</Li> -     </ul> -     <inputtype= "checkbox"checked/> the     <inputtype= "checkbox"checked/> -     <inputtype= "checkbox"/> -     <TableBorder= "1"> -       <TR><TD>LINE1[0]</TD></TR> +       <TR> -           <TD>LINE2[1]</TD> +       </TR> A       <TR><TD>LINE3[2]</TD></TR> at     </Table>     -     <H1>H1</H1> -     <H2>H2</H2> -     <H3>H3</H3> -     <H3>H4</H3> -     <H3>H5</H3> in     <H3>H6</H3> -     <P>P</P> to     <Scripttype= "Text/javascript"> +     /*1) Find the content of the first element in UL - Alert ($ ("ul Li:first"). html ()); the         */ *         //Alert ($ ("ul Li:last"). html ()); $       /*2) Find the content of the last element in ULPanax Notoginseng Alert ($ ("ul Li:last"). html ()); -         */ the            +       /*4) The number of rows for which the index value of the lookup table is even, 0,2,4,6,... A Alert ($ ("Table Tr:even"). Size ()); the           */ +        - Alert ($ ("Table Tr:odd"). Size ()); $       /*5) The number of rows for which the index value of the lookup table is odd, 1,3,5,7,... $ Alert ($ ("Table Tr:odd"). Size ()); -           */ -        the       /*6) Find the contents of the second row in the table, starting with index number 0 - var $tr = $ ("Table Tr:eq (1)");Wuyi var html = $tr. HTML (); the alert (HTML); -           */ Wu Alert ($ ("table Tr:eq (1)"). HTML ()); -       /*7) Find the number of the second third row in the table, that is, the index value is 1 and 2, which is greater than 0 About var $tr = $ ("Table tr:gt (0)"); $ var size = $tr. Size (); - alert (size); -           */  -  A       /*8) Find the number of the first second row in the table, that is, the index value is 0 and 1, which is less than 2 + var $tr = $ ("Table Tr:lt (2)"); the var size = $tr. Size (); - alert (size); $           */  the        the       /*9) Add a red background color to all headings in the page  the $ (": Header"). CSS ("Background-color", "Red"); the           */ -           $(": Header"). CSS ("Background-color","Red"); in       //3) Find out the number of all unchecked input elements the Alert ($ (": Checkbox:not (: Checked)"). Size ()); the            About        the     </Script> the   </Body> the </HTML>

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