迁移自: https://www.cnblogs.com/dashublog/p/illusion.html
人类的大脑时常会被眼睛所看到的画面所欺骗，比如下面这个例子中，黄色和蓝色的“小虫”其实是同步移动的：
不相信的同学可以自己尝试一下，页面源码如下：
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
68
69
70
71
72
73
| <!DOCTYPE html>
<style>
body {
margin: 0;
}
#div1 {
position: relative;
width: 400px;
height: 300px;
border: 1px solid #dddddd;
}
#div1 .bar {
width: 4px;
height: 300px;
float: left;
}
#div1 .bar.b {
background-color: black;
}
#div1 .bar.w {
background-color: white;
}
#div1 .block {
position: absolute;
width: 16px;
height: 4px;
left: 0;
}
#div1 .block.y {
background-color: yellow;
top: 140px;
}
#div1 .block.b {
background-color: blue;
top: 160px;
}
</style>
<div id="div1">
</div>
<script type="text/javascript">
var div1 = document.getElementById('div1');
var tmp = [];
for (var i = 0; i < 100; i++) {
if (i % 2) {
tmp.push('<div class="bar b"></div>');
} else {
tmp.push('<div class="bar w"></div>');
}
}
tmp.push('<div id="blkYellow" class="block y"></div>');
tmp.push('<div id="blkBlue" class="block b"></div>');
div1.innerHTML = tmp.join('');
var blkYellow = document.getElementById('blkYellow'),
blkBlue = document.getElementById('blkBlue');
var walk = function (p) {
blkYellow.style.left = blkBlue.style.left = p + 'px';
window.setTimeout(function () {
walk((p + 2) % 400);
}, 100);
};
walk(0);
</script>
|