/**
* 用于限制传入的数字在 max 和 min 之间
* @param position
* @param min
* @param max
*/
export function bound(position, min, max) {
var ret = position;
if (min !== undefined) {
ret = Math.max(position, min);
}
if (max !== undefined) {
ret = Math.min(ret, max);
}
return ret;
}