mbti.js

// http://wiki.sankuai.com/display/DEV/MBTI_Result

var o = $('#main-content').html().match(/[EINSTFJP]{4}/ig).map(x => x.toUpperCase())
.reduce(function(o, x, i, a) {
  o[x] = o[x] || {};
  o[x].n = (o[x].n || 0) + 1;
  o[x].p = ((o[x].n / a.length) * 100).toFixed(2);
  return o;
}, {});

Object.keys(o).sort((a,b) => o[b].n - o[a].n).forEach(function(n, i){
  console.log(n, o[n].p);
});