大小写字母转数字

let letter=[{
          sLetter:'a',
          sNumber:0,
          bletter:'A',
          bNumber:0
        },{
          sLetter:'b',
          sNumber:0,
          bletter:'B',
          bNumber:0
        },{
          sLetter:'c',
          sNumber:0,
          bletter:'C',
          bNumber:0
        },{
          sLetter:'d',
          sNumber:0,
          bletter:'D',
          bNumber:0
        },{
          sLetter:'y',
          sNumber:0,
          bletter:'Y',
          bNumber:0
        },{
          sLetter:'z',
          sNumber:0,
          bletter:'Z',
          bNumber:0
        }] 
        letter.forEach(function(item){
          item.sNumber=item.sLetter.charCodeAt();
          item.bNumber=item.bletter.charCodeAt();
        });
        console.log(letter);