使用js实现雪花飘落效果_javascript技巧

function start(){

var array=new Array();

var canvas=document.getElementById("mycanvas");

var context=canvas.getContext("2d");

for(var i=0;i<50;i++){

var Showsnow=new showsnow();

array.push(Showsnow);

}

time=setInterval(function (){

context.clearRect(0,0,canvas.width,canvas.height);
for(var i=0;i

array[i].move();
array[i].draw(context);

}

},500);

}
function showsnow(){
var y=parseInt(Math.random()*50)*10;

var x=parseInt(Math.random()*80)*10;

this.draw=function(context){

context.font="50px Calibri";
context.fillText("*",x,y);

}
this.move=function(){
y+=20;

if(y>600){
y=0;
}
}
}