生成某个范围内N个不重复随机数与生成固定长度数组

function getRndNum(num,min,max){    var n = [];    for(var i = min; i < max; i++){        n.push(i);    }    n.sort(function(){return 0.5 - Math.random()});    n.length = num;    return n;}

// 生成某个长度数组
//let lenFun = length => Array.from({length}).map((v,k) => k); 
 let lenFun = length => Array.from({length}, (v, k) => k);