生成递减的随机数

复制代码var num= sessionStorage.getItem("random"); if(!num|| num<=0){ num= parseInt(Math.random()* 10000000); } sessionStorage.setItem("random",num-100); $("selector").text(num);

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

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