种子随机数

        let math = {}
        math.seed = 5; 
        math.random = function(max, min) {
            max = max || 1; 
            min = min || 0; 
            math.seed = (math.seed * 9301 + 49297) % 233280; 
            var rnd = math.seed / 233280.0; 
            return min + rnd * (max - min); 
        }; 
        
        for (var i= 0; i<10; i++) { 
            console.log(math.random() +"<br />"); 
        }