Clone node clone() of jQuery

• The cloned element only exists in the memory, if it needs to be displayed on the page, it must be appended to the page
• The clone() method parameter will be cloned to the descendant node whether it is true or false
• If the parameter of the clone() method is true: it means that the event will be cloned together; if it is false, the event will not be cloned, and the default parameter is false

var div = $("#div").clone()
// 修改克隆节点的id
div.attr('id', 'id1')
// 从内存追加到页面上
$('body').append(div)