前端几行代码简单实现w3school代码预览
代码很简单，利用URL.createObjectURL生成url赋给iframe，就可以不借助服务器实现代码预览了。
demo截图
直接看代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js" type="text/javascript"></script>
<style>
html,
body {
height: 100%;
}
.title-wrapper,
.code-wrapper {
display: flex;
align-items: center;
justify-content: center;
}
h2.title {
width: 50%;
color: red;
padding: 0 20px;
font-size: 14px;
}
.code-wrapper {
width: 100%;
height: 100%;
}
.previewBtn {
display: inline-block;
padding: 5px 30px;
background-color: red;
color: #fff;
text-decoration: none;
}
.code,
.preview-container {
width: 50%;
height: 100%;
overflow: hidden;
border: 1px solid #ccc;
}
.code {
margin-right: 10px;
}
.code textarea {
width: 100%;
height: 100%;
white-space: pre;
resize: none;
border: none;
outline: none;
}
.preview-container .preview {
width: 100%;
height: 100%;
}
.preview-container iframe {
display: block;
border: none;
outline: none;
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<p>
<a class="previewBtn" href="javascript:;" onclick="onPreview()">预览</a>
</p>
<div class="title-wrapper">
<h2 class="title">编辑代码：</h2>
<h2 class="title">查看效果：</h2>
</div>
<div class="code-wrapper">
<div class="code">
<textarea class="js-code"></textarea>
</div>
<div class="preview-container">
<div class="preview js-preview"></div>
</div>
</div>
<script>
function onPreview () {
var code = $('.js-code').val(), //获取代码字符串
$preview = $('.js-preview'),
blob = new Blob([code], { //注意一定要写type
'type': 'text/html'
}),
url = URL.createObjectURL(blob), //生成url
$iframe = $('<iframe src="' + url + '"></iframe>');
$preview.html('').append($iframe);
}
</script>
</body>
</html>
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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95