for循環(huán)變量定義問(wèn)題
for(var?mymoney=1;mymoney<=10;mymoney++)
{?
??sum=?sum?+?mymoney;
}為什么這樣結(jié)果與下面的結(jié)果不一樣呢
var?mymoney,sum=0;
qq_Everytime_1
2017-10-09
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2018-07-16
<script?type="text/JavaScript"> ????var?mymoney,sum=0; ????for(var?mymoney=1;mymoney<=10;mymoney++){? ????????sum=?sum?+?mymoney; ?????}? ????document.write("sum合計(jì):"+sum); </script>2017-10-09
上面的代碼沒(méi)有聲明sum，可以在前面假設(shè)var sum=0;