var num = 10;???????????function fn(){????????????????num = 20;???????????????alert(num)???????????}??????????alert(num)會(huì)輸出什么？函數(shù)會(huì)自動(dòng)運(yùn)行嗎？
請(qǐng)問(wèn)js里函數(shù)會(huì)自動(dòng)運(yùn)行嗎？
劉毅毅
2016-10-15 19:02:36
