.clone（[withDataAndEvents][,deepWithDataAndEvents]) 创建jQuery集合的一份deep copy（子元素也会被复制），默认不copy对象的shuju和绑定事件
Create a deep copy of the set of matched elements.
$( “.hello” ).clone().appendTo( “.goodbye” );
.parent([selector]) 获取jQuery对象符合selector的父元素
Get the parent of each element in the current set of matched elements, optionally filtered by a selector.
$( “li.item-a” ).parent(‘ul’).css( “background-color”, “red” );
.parents([selector]) 获取jQuery对象符合选择器的祖先元素
Get the ancestors of each element in the current set of matched elements, optionally filtered by a selector.
$( “span.selected” ) .parents( “div” ) .css( “border”, “2px red solid” )
插入元素
.append(content[,content]) / .append(function(index,html)) 向对象尾部追加内容
Insert content, specified by the parameter, to the end of each element in the set of matched elements.
1. 可以一次添加多个内容，内容可以是DOM对象、HTML string、 jQuery对象
2. 如果参数是function，function可以返回DOM对象、HTML string、 jQuery对象，参数是集合中的元素位置与原来的html值
$( “.inner” ).append( “<p>Test</p>” );
$( “body” ).append( $newdiv1, [ newdiv2, existingdiv1 ] );
$( “p” ).append( “<strong>Hello</strong>” );
$( “p” ).append( $( “strong” ) );
$( “p” ).append( document.createTextNode( “Hello” ) );
.appendTo(target) 把对象插入到目标元素尾部，目标元素可以是selector, DOM对象, HTML string, 元素集合,jQuery对象;
Insert every element in the set of matched elements to the end of the target.
$( “h2” ).appendTo( $( “.container” ) );
$( “<p>Test</p>” ).appendTo( “.inner” );
.prepend(content[,content]) / .prepend(function(index,html)) 向对象头部追加内容，用法和append类似
Insert content, specified by the parameter, to the beginning of each element in the set of matched elements.
$( “.inner” ).prepend( “<p>Test</p>” );
.prependTo(target) 把对象插入到目标元素头部，用法和prepend类似
Insert every element in the set of matched elements to the beginning of the target.
$( “<p>Test</p>” ).prependTo( “.inner” );
.before([content][,content]) / .before(function) 在对象前面(不是头部，而是外面，和对象并列同级)插入内容，参数和append类似
