<!DOCTYPE html>
<br><br> p {<br><br> background: lightpink;<br><br> margin: 6px 0;<br><br> }<br><br> p.ll{<br> line-height:30px;<br> }<br>
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Click here to Attach/detach all p elements. $( "p" ).click(function() { $( this ).toggleClass( "ll" ); }); var p; $( "button" ).click(function() { if ( p ) { p.appendTo( "body" ); p = null; } else { p = $( "p" ).detach(); } });
代码如上，请问这段代码中定义的变量'p'代指什么吗？
