我陷入了有关javascript中的雪动画的项目中

Question

我必须创建一个脚本来模拟javascript中雪的动画（如果可能，我希望不使用画布）。我被困在这一点上，我不知道错误在哪里。当我运行程序谷歌浏览器崩溃且控制台没有给我错误时，我认为该错误是由于循环或某些不正确的语句所致，我附上了代码，希望对您有所帮助！

    var direction=true; //true=right false =left
    var active=true;     //if true run the cycle,false stops the cycle
    function startSnow() 

var _snowflakes = new Array(30);    
var wid=50;                       //distance from a snowflake to another
var counterX;                     //var for editing the x position
var counterY;                     //var for editing the y position
for (var i=0; i< 30; i++)         //cycle that initializes snowflakes

    _snowflakes[i] = document.createElement("img");   
    _snowflakes[i].setAttribute("src","snowflake.png"); // setting the image
    _snowflakes[i].setAttribute("class", "snowflake"); //setting the css style
    _snowflakes[i].style.visibility ="inherit";       //when the function is running snowflakes have to be visible, when it finishes they have to be invisible
    _snowflakes[i].style.right = (wid*i)+"px";        //set the distance from the left margin
    _snowflakes[i].style.top = "30px";           // set the distance from the top
    document.getElementById("background").appendChild(_snowflakes[i]);

while(active)

        move();

function move()  //function that moves the snowflake
        
            for(;;)
        
            if(counterY>=600)   //when the snowflake reaches 600px from the top the function has to stop and hide snowflakes
            
                for(var i=0;i<30;i++)
                    _snowflakes[i].style.visibility = "hidden";
                active=false;
                break;
                            
             else
            
                if ((counterY%50)==0)
                    
                        direction=!direction   //every 50 Y pixels the snoflake change direction
                    
                counterY++;
                for(var i=0;i<30;i++)
                    
                        _snowflakes[i].style.top = counterY+"px";       //Y movement     
                        if (direction==true)
                            
                                _snowflakes[i].style.right = (_snowflakes[i].offsetLeft+counterX) + "px";      //x right movement
                                counterX++;
                            
                        else
                            
                                _snowflakes[i].style.right = (_snowflakes[i].offsetLeft+counterX) + "px";      //x left movement
                                counterX--;