Keydown事件代码

Question

在文本框的KeyDown事件中，我可以检查一系列keyCode

例如：

if (e.keyCode == 90 to 97 || e.keyCode == 104 to 110)

如何以正确的方式写出来？

Answer 1

var inInterval = function (code, min, max) {
    return code >= min && code <= max;
};

if (inInterval(e.keyCode, 90, 97) || inInterval(e.keyCode, 104, 110))

或者，更好一点：

var interval = function (min, max) {
    return {
        min: min,
        max: max,
        contains : function (elem) {
            return this.min <= elem && elem <= this.max;
        }
    };
};

interval(90, 98).contains(92); // true
interval(90, 98).contains(15); // false

Answer 2

if ((e.keyCode > 89 && e.keyCode < 98) || (e.keyCode > 103 && e.keyCode < 111))

或：

if ((e.keyCode >= 90 && e.keyCode <= 97) || (e.keyCode >= 104 && e.keyCode <= 110))

Answer 3

if ((90 <= e.keyCode && e.keyCode <= 97) || (104 <= e.keyCode && e.keyCode <= 110))

Answer 4

var myKeycodes = [1,2,3,4,5,6];
if(myKeycodes.indexOf(e.keyCode) != -1){
    // your keycode is in the array, do stuff
}