javascript jquery Append方法

• .append( content [, content] )

  contentDOM element, HTML string, or jQuery object to insert at the end of each element in the set of matched elements.

  contentOne or more additional DOM elements, arrays of elements, HTML strings, or jQuery objects to insert at the end of each element in the set of matched elements.

• version added: 1.4.append( function(index, html) )

  function(index, html)A function that returns an HTML string, DOM element(s), or jQuery object to insert at the end of each element in the set of matched elements. Receives the index position of the element in the set and the old HTML value of the element as arguments. Within the function, this refers to the current element in the set.