生成递减的随机数

var num= sessionStorage.getItem("random");
    if(!num|| num<=0){
        num= parseInt(Math.random()* 10000000);

    }
    sessionStorage.setItem("random",num-100);
    $("selector").text(num);

 

转载于:https://www.cnblogs.com/JaniceDong/p/9086663.html