?? ???? a.value="5644445";//?? ??? ??? ??? ?b.onclick=function(){//?? ??? ?//?? ??? ??? ??? ?if(isNaN(a.value))//?? ??? ??? ??? ?{//?? ??? ??? ??? ??? alert(a.value)????????? ?//?? ??? ??? ??? ??? alert("1");//?? ??? ??? ??? ?}//?? ??? ??? ??? ?else//?? ??? ??? ??? ?{//?? ??? ??? ??? ??? ?alert(a.value)//?? ??? ??? ??? ???? alert(2);???????????????????? //正常會進入 else//?? ??? ??? ??? ?}//?? ??? ??? ?}//?? ??? ??? ??? ?//?? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ??? ?b.onclick=function(){?? ??? ??? ??? ??? ?var c=a.value;?? ??? ??? ??? ??? ?if(isNaN(c))?? ??? ??? ??? ??? ?{?? ??? ??? ??? ??? ??? ?alert(Number(c))????????? //即使輸入為 "5644445";? 就會轉為NaN為什么？?? ??? ??? ??? ??? ??? ?alert(1);?? ??? ??? ??? ??? ?}?? ??? ??? ??? ??? ?else?? ??? ??? ??? ??? ?{?? ??? ??? ??? ??? ??? ?alert(Number(c))?? ??? ??? ??? ??? ??? ?alert(2)?? ??? ??? ??? ??? ?}?? ??? ??? ??? ?}
js 關于數據類型的問題 好多大牛都回答不了 跪求答案
偉大的五年
2016-07-20 12:13:11
