I tried this code can someone help me to solve this I got error because of this code when I write directly ID and quantity into update.js it works but if I try to put whole sting into variable and then pass it in update.js it doesn't work can you help me to solve this

var p = JSON.stringify({39470423048307:0,32164693278835:0,32164693835891:1});
jQuery.post('/cart/update.js', {updates: p});