gistfile1.js

var paras = $("p");

// all paras get object with cherry flavor
paras.data("desert", { flavor: "cherry" });

// modify flavor property of the first para
$(paras.get(0)).data("desert").flavor = "lime";

// see flavor property  of the second para
console.log( $(paras.get(1)).data("desert").flavor ); // it's lime

// all paras get primitive value with size
paras.data("size", "grande");

// modify the size on the first para
$(paras.get(0)).data("size", "vente");

// see size property  of the second para
console.log( $(paras.get(1)).data("size") ); // it's grande