Javascript dec to hex

Question

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");
}

我有以下代码当我在提示中输入一个号码时，它会提醒相同的号码示例：我输入256警报：256

Answer 1

prompt将返回一个string。只需先将其转换为普通的number即可。

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

试试这个

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");
}