冒泡排序

//冒泡排序
    var temp;//临时变量
    var attr = [8,4,6,3,12,5,7];
    for (var j = attr.length;j > 0; j--) ////外层，控制有几个数值比较
    {
        for (var i =0; i < j-1;i++) //内层，
        {
             if (attr[i]<attr[i+1]) //从大到小排序
             {
                 temp = attr[i+1]
                 attr[i+1]= attr[i]
                 attr[i] = temp
             }             
        }        
    }
    document.write(attr);
    /*for (var j = 0;j < attr.length; j++) //外层，控制有几个数值比较
    {
        for (var i =0; i < attr.length-1;i++) //内层，取得最值
        {
             if (attr[i]>attr[i+1]) 
             {
                 temp = attr[i+1]
                 attr[i+1]= attr[i]
                 attr[i] = temp
             }             
        }        
    }console.log(attr);*/