<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>字符乱码特效</title>
</head>
<style>
* {
margin: 0;
padding: 0;
}
body {
overflow: hidden;
}
</style>
<body>
<canvas id="canvas" width="1280" height="1024"> 您的浏览器不支持canvas标签，请您更换浏览器 </canvas>
</body>
<script>
var canvas = document.getElementById("canvas");
var can = canvas.getContext("2d");
var s = window.screen;
var w = canvas.width = s.width;
var h = canvas.height = s.height;
can.fillStyle = color2();
var words = Array(256).join("1").split("");
setInterval(draw, 50);
function draw() {
can.fillStyle = 'rgba(0,0,0,0.05)';
can.fillRect(0, 0, w, h);
can.fillStyle = color2();
words.map(function(y, n) {
text = String.fromCharCode(Math.ceil(65 + Math.random() * 57));
x = n * 10;
can.fillText(text, x, y)
words[n] = (y > 758 + Math.random() * 484 ? 0 : y + 10);
});
}
function color1() {
var colors = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'a', 'b', 'c', 'd', 'e', 'f'];
var color = "";
for (var i = 0; i < 6; i++) {
var n = Math.ceil(Math.random() * 15);
color += "" + colors[n];
}
return '#' + color;
}
function color2() {
var color = Math.ceil(Math.random() * 16777215).toString(16);
while (color.length < 6) {
color = '0' + color;
}
return '#' + color;
}
function color3() {
return "#" + (function(color) {
return new Array(7 - color.length).join("0") + color;
})((Math.random() * 0x1000000 << 0).toString(16))
}
</script>
</html>
