问我想让用户把值放进去，然后在周末后用javascript在控制台中显示总数。

EN

var day = 1;
var totalletters = 0; //total letters sent


for (day; day <= 7; day++) {
  var getletters = 0;
  getletters = prompt("Please enter the number of total letters sent today", );
  totalletters += getletters;
}

console.log(totalletters); //displaying the total number of letters sent at the end of the week

// The console is showing the output as string instead of adding up the numbers