的Javascript分解爲十六進制

Question

var dec = prompt("Enter a number"); 
 

 
if (dec != null && dec > 0) { 
 
\t var hex = dec.toString(16); 
 
\t alert(hex); 
 
} 
 
else { 
 
\t alert("number must be greater than 0"); 
 
}

我有以下代碼 ，當我輸入一個數字的提示它會提醒相同數量 例：I輸入256 提醒：256

Answer 1

prompt將返回string。首先將它轉換爲普通的number。

var dec = +prompt("Enter a number"); 

if (dec != null && dec > 0) { 
    var hex = dec.toString(16); 
    alert(hex); 
} 
else { 
    alert("number must be greater than 0"); 
} 

Answer 2

試試這個

var dec = prompt("Enter a number"); 

if (dec != null && dec > 0) { 
    var hex = parseInt(dec,16); 
    alert(hex); 
} 
else { 
    alert("number must be greater than 0"); 
}