页首html代码-字符掉落
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<title>咩咩的咣咣 </title>
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<script src="/js/blog-common.min.js?v=cjOfeR1PvDfGLdLnzp3exmJckxUGinvOfscZzbIEshk"></script>
<script>
var currentBlogId = 517373;
var currentBlogApp = 'rhgaiymm';
var cb_enable_mathjax = false;
var isLogined = true;
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<canvas id="c"></canvas>
<script type="text/javascript" >/* 一段从天而降的代码*/
var c = document.querySelector("#c");
var ctx = c.getContext("2d");
//making the canvas full screen
c.height = window.innerHeight;
c.width = window.innerWidth;
//chinese characters - taken from the unicode charset
var chinese = "天 地 玄 黄 ，宇 宙 洪 荒 。 日 月 盈 昃 ， 辰 宿 列 张 。";
//converting the string into an array of single characters
chinese = chinese.split("");
var font_size = 10;
var columns = c.width / font_size; //number of columns for the rain
//an array of drops - one per column
var drops = [];
//x below is the x coordinate
//1 = y co-ordinate of the drop(same for every drop initially)
for (var x = 0; x < columns; x++)
drops[x] = 1;
//drawing the characters
function draw() {
//Black BG for the canvas
//translucent BG to show trail
ctx.fillStyle = "rgba(0, 0, 0, 0.05)";
ctx.fillRect(0, 0, c.width, c.height);
ctx.fillStyle = "#0F0"; //green text
ctx.font = font_size + "px arial";
//looping over drops
for (var i = 0; i < drops.length; i++) {
//a random chinese character to print
var text = chinese[Math.floor(Math.random() * chinese.length)];
//x = i*font_size, y = value of drops[i]*font_size
ctx.fillText(text, i * font_size, drops[i] * font_size);
//sending the drop back to the top randomly after it has crossed the screen
//adding a randomness to the reset to make the drops scattered on the Y axis
if (drops[i] * font_size > c.height && Math.random() > 0.975)
drops[i] = 0;
//incrementing Y coordinate
drops[i]++;
}
}
setInterval(draw, 50);</script>
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