data and each in jquery

//We can call it via:
$("div").data("role") === "page";
$("div").data("hidden") === true;
$("div").data("options").name === "John";

Data is good for preventing race conditions.

//Given this HTML Structure

• Apple
• Orange
• Mango
• Blueberry
• Watermelon

//We can retrieve the value with:
$('li').each(function(index) {
alert(index + ': ' + $(this).text());
});


//Alternatively, loop through JSON
var data = "{ name: "John", lang: "JS" }";

$.each( data, function(k, v){
alert( "Key: " + k + ", Value: " + v );
});