add: last_time = Date.now(); 
context:           global.addEventListener('keydown', function(e) {            //console.log(e);            switch(e.keyCode) {              case 87:                vec4.scale(tmp_v1, camera.rz, settings.speed*(Date.now() - last_time));                vec4.add(camera.p, camera.p, tmp_v1);                break;            }            //e.preventDefault();            e.stopPropagation();          });
meta: 5665	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5665/0f8ba5d109269d49d72be1d776721a5a867dd729/NGrid.js/buggy/lib/NGrid.js