javascript - 在代码中避免使用 if else

Question

function get_map_zoom_level(distance) {
    var zoom = 1;
    if (distance == 0)
        zoom = 11;
    else if (distance == 1)
        zoom = 15;
    else if (distance > 880 && distance <= 1760)
        zoom = 14;
    else if (distance > 1760 && distance <= 3520)
        zoom = 13;
    else if (distance > 3520 && distance <= 7040)
        zoom = 12;
    else if (distance > 7040 && distance <= 14080)
        zoom = 11;
    else if (distance > 14080 && distance <= 28160)
        zoom = 10;
    else if (distance > 28160 && distance <= 56320)
        zoom = 9;
    else if (distance > 56320 && distance <= 112640)
        zoom = 8;
    else if (distance > 112640 && distance <= 225280)
        zoom = 7;
    else if (distance > 225280 && distance <= 450560)
        zoom = 6;
    else if (distance > 450560 && distance <= 889120)
        zoom = 5;
    else if (distance > 889120 && distance <= 1718240)
        zoom = 4;
    else if (distance > 1718240)
        zoom = 3;
    return zoom;
}

我想知道在这段代码中是否有任何方法可以避免很多if else。 基本上我想根据距离找出缩放级别，这段代码运行良好，但我需要一些更好的方法来做到这一点。

Answer 1

这应该有效:

function get_map_zoom_level(distance) {
var zoom = 15;
var temp=880;
if (distance == 0)
    zoom = 11
while (distance > temp){
    temp=temp*2;
    zoom--;
}
return zoom;
}