-
Notifications
You must be signed in to change notification settings - Fork 2
/
react-setstate.html
166 lines (140 loc) · 6.55 KB
/
react-setstate.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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta http-equiv="Cache-Control" content="no-siteapp">
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=1, minimum-scale=1, maximum-scale=1">
<meta name="referrer" content="never">
<meta name="robots" content="index,follow">
<link rel="shortcut icon" href="/favicon.png?v=198964">
<link rel="apple-itouch-icon" href="/favicon.png?v=198964">
<link href="/bundle/index.min.css" rel="stylesheet">
<link href="https://fonts.loli.net/css?family=Merriweather:300,700,700italic,300italic|Open+Sans:700,400" rel="stylesheet">
<link href="https://cdn.staticfile.org/prism/1.16.0/themes/prism.min.css" rel="stylesheet">
<link href="https://cdn.staticfile.org/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
<script>
function ensureDate(e){return"object"!=typeof e&&(e=new Date(e)),e}function dateFormat(e,t){void 0===t&&(t=e,e=ensureDate());let n={M:(e=ensureDate(e)).getMonth()+1,d:e.getDate(),h:e.getHours(),m:e.getMinutes(),s:e.getSeconds(),q:Math.floor((e.getMonth()+3)/3),S:e.getMilliseconds()},r=new RegExp("([yMdhmsqS])+","g");return t=t.replace(r,function(t,r){let u=n[r];if(void 0!==u)return t.length>1&&(u=(u="0"+u).substring(u.length-2)),u;if("y"===r){return(e.getFullYear()+"").substring(4-t.length)}return t})}
</script>
<meta name="keywords" content="React setState 数组、对象多种方式,React,">
<meta name="description" content="React setState 数组、对象多种方式,React,">
<meta name="author" content="江矿先森.">
<title>React setState 数组、对象多种方式</title>
<link href="/bundle/iconfont.css" rel="stylesheet">
<link href="/bundle/reward.css" rel="stylesheet">
<script src='/bundle/av.min.js'></script>
<script src='/bundle/valine.min.js'></script>
</head>
<body>
<article class="container">
<header class="header-wrap asset">
<nav class="main-nav">
<ul class="menu vertical naive">
<li class="menu-item"><a href="/">Home</a></li>
<li class="menu-item"><a href="/archive.html">Archive</a></li>
<li class="menu-item"><a href="/tag.html">Tag</a></li>
<li class="menu-item"><a href="/atom.xml">RSS</a></li>
</ul>
</nav>
<div class="bgs" style="background-image: url(https://s11.ax1x.com/2024/02/04/pFlmAII.jpg);"></div>
<div class="vertical">
<div class="header-wrap-content inner">
<h3 class="title">Stay before every beautiful thoughts.</h3>
<h3 class="subtitle">Just be nice, always think twice!</h3>
</div>
</div>
</header>
<article class="main article">
<h1 class="title">React setState 数组、对象多种方式</h1>
<section class="info">
<span class="avatar" style="background-image: url(https://s11.ax1x.com/2024/02/04/pFlmVit.jpg);"></span> <a class="name" href="javascript:;">江矿先森.</a>
<span class="date"><script>document.write(dateFormat( 1579937034 *1000, 'yyyy-MM-dd'))</script></span>
<span class="tags"><a class="tages" href="/tag/React/index.html">React</a></span>
</section>
<article class="content"><h3>修改object中某项</h3>
<pre><code class="language-js">this.setState({
object: {...object, key: value}
});
</code></pre>
<h3>删除数组首位</h3>
<pre><code class="language-js">array.splice(0, 1);
this.setState({
array
});
</code></pre>
<h3>删除数组尾部</h3>
<pre><code class="language-js">array.splice(array.length - 1);
this.setState({
array
});
</code></pre>
<h3>删除数组任意一项</h3>
<pre><code class="language-js">array.splice(index, 1);
this.setState({
array
});
</code></pre>
<h3>数组尾部添加一项</h3>
<pre><code class="language-js">this.setState({
array: [...array, item]
});
</code></pre>
<h3>数组头部添加一项</h3>
<pre><code class="language-js">this.setState({
array: [item, ...array]
});
</code></pre>
<h3>数组任意位置添加一项</h3>
<pre><code class="language-js">array.splice(index, 0, item);
this.setState({
array
});
</code></pre>
<h3>修改数组中任意一项中值</h3>
<pre><code class="language-js">function updateArrayItem(index, key, value) {
this.setState({
array: array.map((item, _index) => _index == index ? {...item, [key]: value} : item)
});
}
</code></pre>
<h3>复杂类型修改</h3>
<pre><code class="language-js">this.setState(prevState => return newState);
</code></pre>
</article>
<section class="author">
<div class="avatar" style="background-image: url(https://s11.ax1x.com/2024/02/04/pFlmVit.jpg);"></div>
<a class="name" href="javascript:;">江矿先森.</a>
<div class="intro">前(台)端(菜), 喜欢瞎折腾新技术. 乜野都识少少, 先可以扮代表:p</div>
</section>
<section class="social">
<a href="https://github.com/joname1" target="_blank">
<i class="iconfont i-github"></i>
</a>
<a href="javascript:alert('你电脑中了不知名的病毒, 并抛出了警告 atob(“d3hJZDogZXJyb3IuZXJyb3I=”)')" target="_blank">
<i class="iconfont i-wechat"></i>
</a>
<a href="https://www.zhihu.com/topic/19550901" target="_blank">
<i class="iconfont i-zhihu"></i>
</a>
<a href="javascript:alert('对方不想跟你讲话, 并向你扔来一段乱码 atob(“ZXJyb3JAZXJyb3IuZXJyb3I=”)')" target="_blank">
<i class="iconfont i-email"></i>
</a>
</section>
<div id="comment"></div>
</article>
</article>
<footer class="footer clearfix">
<span class="copyright">
<script>
document.write(new Date().getFullYear());
</script> <i class="fa fa-copyright"></i> Made with <i class="fa fa-heart"></i> using <joname />
<span id="runtime_span"></span>
</span>
</footer>
<script src="/bundle/index.min.js"></script>
<script src="https://cdn.staticfile.org/prism/1.16.0/prism.min.js"></script>
<script>
new Valine({el: '#comment',appId: 'PieJ3iHvVTJ9C5yBudK6sxaT-MdYXbMMI',appKey: 'Yt25unM4vc9wzBvC2lL20Frc',placeholder: 'ヾﾉ≧∀≦)o来啊, 快活啊, 反正有大把时光!!',path: window.location.pathname,avatar: 'retro',pageSize: 10,guest_info: ['nick', 'mail'],lang: 'en'});
</script>
</body>
</html>