how to get all data which stored in jquery.data()

You can call .data() without any arguments to get all an object with all the entries, like this:

$("div").data() //returns object

This object will have all they keys available, for example if:

$("div").data("thing") //returns "value"

Then $("div").data() would return at least:

{ thing: "value" }

JQuery documentation: http://api.jquery.com/data/#data

$("div").data();