var mymoney;//mymoney變量存放不同面值，sum總計(jì)var sum=mymoney;for(mymoney=1;mymoney<=10;mymoney++){?? ?document.write(sum=sum+mymoney);}最終為什么得到12141721263239475666這樣一個(gè)值？以及var mymoney,sum;//mymoney變量存放不同面值，sum總計(jì)for(mymoney=1;mymoney<=10;mymoney++){?? sum= sum + mymoney;}document.write("sum合計(jì):"+sum);?輸出值為什么是110？以及var mymoney;var sum=mymoney;for(mymoney=1;mymoney<=10;mymoney++){?? ?sum=sum+mymoney;}document.write("sum的值"+sum);輸出值為什么是66？