|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
<!DOCTYPE html><html lang="en">
<head> <meta charset="UTF-8">
<title>二进制雨</title>
</head><body><div style="color:red;text-align: center;font-size: 20px;">二进制雨</div>
<canvas id="myCanvas" width="1000px" height="600px" style="background-color: black;"></canvas>
<script> var draw=function(ctx,x,y,size){
this.ctx=ctx;
this.x=x;
this.y=y;
this.size=size;
var y1=this.y;
this.drawText=function(){
var str=Math.ceil(Math.random()*10000).toString(2);
var grd=this.ctx.createLinearGradient(this.x,this.y,this.x,this.y-this.ctx.measureText(str).width);
grd.addColorStop(0,"#00FF00");
grd.addColorStop(1,"#004400");
this.ctx.fillStyle=grd;
this.ctx.font=this.size+"px Arial";
for(var i=str.length-1;i>=0;i--) {
this.ctx.fillText(str.charAt(i), this.x, y1-=15);
}
y1=this.y+=10;
if(y1-720+this.ctx.measureText(str).width>0){
this.x=Math.ceil(Math.random()*1000);
y1=this.y=Math.ceil(Math.random()*100);
}
}
};
var rain=function(ctx,length){
this.length=length;
this.ctx=ctx;
var x=[];
var y=[];
var size=[];
var texts=[];
var i=0;
for(;i<length;i++){
x[i]=Math.ceil(Math.random()*1000);
y[i]=Math.ceil(Math.random()*500);
size[i]=Math.ceil(Math.random()*15);
texts[i]=new draw(this.ctx,x[i],y[i],size[i]);
}
this.run=function(){
ctx.clearRect(0,0,1000,600);
for(var j=0;j<length;j++){
texts[j].drawText();
}
};
};
var canvas=document.getElementById("myCanvas");
var ctx=canvas.getContext("2d");
var rain0=new rain(ctx,100);
setInterval(rain0.run,50);
</script></body></html> |
这是以前的博客 效果还行吧。手机看不了 看了也卡。。。。http://blog.chinaunix.net/uid-30494608-id-5201548.html