Repository navigation
Expand file tree
/
Copy pathindex.html
More file actions
2914 lines (952 loc) · 66.2 KB
/
Copy pathindex.html
File metadata and controls
2914 lines (952 loc) · 66.2 KB
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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<!DOCTYPE html>
<html class="theme-next pisces use-motion" lang="zh-CN">
<head><meta name="generator" content="Hexo 3.8.0">
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=2">
<meta name="theme-color" content="#222">
<link rel="stylesheet" href="/lib/font-awesome/css/font-awesome.min.css?v=4.6.2">
<link rel="stylesheet" href="/css/main.css?v=7.0.1">
<link rel="apple-touch-icon" sizes="180x180" href="/favicon/apple-touch-icon.png?v=7.0.1">
<link rel="icon" type="image/png" sizes="32x32" href="/favicon/favicon-32x32.png?v=7.0.1">
<link rel="icon" type="image/png" sizes="16x16" href="/favicon/favicon-16x16.png?v=7.0.1">
<link rel="mask-icon" href="/favicon/safari-pinned-tab.svg?v=7.0.1" color="#222">
<script id="hexo.configurations">
var NexT = window.NexT || {};
var CONFIG = {
root: '/',
scheme: 'Pisces',
version: '7.0.1',
sidebar: {"position":"left","display":"post","offset":12,"onmobile":false,"dimmer":false},
back2top: true,
back2top_sidebar: false,
fancybox: false,
fastclick: false,
lazyload: false,
tabs: true,
motion: {"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},
algolia: {
applicationID: '',
apiKey: '',
indexName: '',
hits: {"per_page":10},
labels: {"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}
}
};
</script>
<meta name="description" content="PJONE的博客">
<meta property="og:type" content="website">
<meta property="og:title" content="PJONE">
<meta property="og:url" content="http://blog.captainp.cn/index.html">
<meta property="og:site_name" content="PJONE">
<meta property="og:description" content="PJONE的博客">
<meta property="og:locale" content="zh-CN">
<meta name="twitter:card" content="summary">
<meta name="twitter:title" content="PJONE">
<meta name="twitter:description" content="PJONE的博客">
<link rel="canonical" href="http://blog.captainp.cn/">
<script id="page.configurations">
CONFIG.page = {
sidebar: "",
};
</script>
<title>PJONE</title>
<noscript>
<style>
.use-motion .motion-element,
.use-motion .brand,
.use-motion .menu-item,
.sidebar-inner,
.use-motion .post-block,
.use-motion .pagination,
.use-motion .comments,
.use-motion .post-header,
.use-motion .post-body,
.use-motion .collection-title { opacity: initial; }
.use-motion .logo,
.use-motion .site-title,
.use-motion .site-subtitle {
opacity: initial;
top: initial;
}
.use-motion .logo-line-before i { left: initial; }
.use-motion .logo-line-after i { right: initial; }
</style>
</noscript>
</head>
<body itemscope itemtype="http://schema.org/WebPage" lang="zh-CN">
<div class="container sidebar-position-left
page-home">
<div class="headband"></div>
<header id="header" class="header" itemscope itemtype="http://schema.org/WPHeader">
<div class="header-inner"><div class="site-brand-wrapper">
<div class="site-meta">
<div class="custom-logo-site-title">
<a href="/" class="brand" rel="start">
<span class="logo-line-before"><i></i></span>
<span class="site-title">PJONE</span>
<span class="logo-line-after"><i></i></span>
</a>
</div>
<p class="site-subtitle">PJ博客</p>
</div>
<div class="site-nav-toggle">
<button aria-label="切换导航栏">
<span class="btn-bar"></span>
<span class="btn-bar"></span>
<span class="btn-bar"></span>
</button>
</div>
</div>
<nav class="site-nav">
<ul id="menu" class="menu">
<li class="menu-item menu-item-home menu-item-active">
<a href="/" rel="section"><i class="menu-item-icon fa fa-fw fa-home"></i> <br>首页</a>
</li>
<li class="menu-item menu-item-about">
<a href="/about/" rel="section"><i class="menu-item-icon fa fa-fw fa-user"></i> <br>关于</a>
</li>
<li class="menu-item menu-item-tags">
<a href="/tags/" rel="section"><i class="menu-item-icon fa fa-fw fa-tags"></i> <br>标签</a>
</li>
<li class="menu-item menu-item-categories">
<a href="/categories/" rel="section"><i class="menu-item-icon fa fa-fw fa-th"></i> <br>分类</a>
</li>
<li class="menu-item menu-item-archives">
<a href="/archives/" rel="section"><i class="menu-item-icon fa fa-fw fa-archive"></i> <br>归档</a>
</li>
<li class="menu-item menu-item-navigation">
<a href="/navigation/" rel="section"><i class="menu-item-icon fa fa-fw fa-compass"></i> <br>导航</a>
</li>
</ul>
</nav>
</div>
</header>
<main id="main" class="main">
<div class="main-inner">
<div class="content-wrap">
<div id="content" class="content">
<section id="posts" class="posts-expand">
<article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
<div class="post-block">
<link itemprop="mainEntityOfPage" href="http://blog.captainp.cn/2020/01/01/网站优化实战/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="name" content="PJONE">
<meta itemprop="description" content="PJONE的博客">
<meta itemprop="image" content="/images/captain.jpg">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="PJONE">
</span>
<header class="post-header">
<h1 class="post-title" itemprop="name headline">
<a href="/2020/01/01/网站优化实战/" class="post-title-link" itemprop="url">网站首屏优化实战</a>
</h1>
<div class="post-meta">
<span class="post-time">
<span class="post-meta-item-icon">
<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2020-01-01 15:20:51 / 修改时间：16:07:56" itemprop="dateCreated datePublished" datetime="2020-01-01T15:20:51+08:00">2020-01-01</time>
</span>
<span class="post-category">
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-folder-o"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/前端/" itemprop="url" rel="index"><span itemprop="name">前端</span></a></span>
</span>
<div class="post-symbolscount">
<span class="post-meta-item-icon">
<i class="fa fa-file-word-o"></i>
</span>
<span class="post-meta-item-text">本文字数：</span>
<span title="本文字数">496</span>
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-clock-o"></i>
</span>
<span class="post-meta-item-text">阅读时长 ≈</span>
<span title="阅读时长">1 分钟</span>
</div>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<div class="note ">
<p>最近，演示系统的功能开发大体上完成了，然后部署在我的腾讯云服务器上，给老师体验使用。上一次给老师体验的时候，是直接把源码发过去的，现在把网址发过去就行了，比较方便。后面的工作就是优化细节，补充功能，完善页面。下面这篇博客记录首屏加载的优化。</p>
</div>
<h1 id="背景"><a href="#背景" class="headerlink" title="背景"></a>背景</h1><h2 id="服务器情况"><a href="#服务器情况" class="headerlink" title="服务器情况"></a>服务器情况</h2>
<p>这是在腾讯云上能买到的最低价的服务器，带宽有限，这是瓶颈这一。没办法，资金不足。</p>
<h2 id="部署工具"><a href="#部署工具" class="headerlink" title="部署工具"></a>部署工具</h2><p>通过Nginx构建静态网站，因为此项目没有使用Vue、React等主流相对较大的框架，同时也没有做用户系统，同时也不需要和后台交互，因此只要服务器把HTML文件返回即可。浏览器再根据HTML文件上的资源，再作相应的请求。</p>
<h2 id="优化前状态"><a href="#优化前状态" class="headerlink" title="优化前状态"></a>优化前状态</h2><p>打开Chrom的控制台，可以看到整个网站加载的时间是3.55s。<br><img src="/2020/01/01/网站优化实战/all_time.png" class="网站优化实战"><br>下载时间最长，相应的也是最大的文件是boostrape的css文件。尽管是min版本，大小还是不容忽视，下载时间达2.50s<br><img src="/2020/01/01/网站优化实战/boost_css.png" class="网站优化实战"><br>总时间最长的是boostrape的js文件，因为用到了boostrape的一些组件，所以就引入了其js文件。文件大小不大，但等待的时间长，达3.38s，总时长为3.55s<br><img src="/2020/01/01/网站优化实战/boost_js.png" class="网站优化实战"></p>
<h1 id="优化"><a href="#优化" class="headerlink" title="优化"></a>优化</h1>
</div>
<footer class="post-footer">
<div class="post-eof"></div>
</footer>
</div>
</article>
<article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
<div class="post-block">
<link itemprop="mainEntityOfPage" href="http://blog.captainp.cn/2019/12/17/jq-load/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="name" content="PJONE">
<meta itemprop="description" content="PJONE的博客">
<meta itemprop="image" content="/images/captain.jpg">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="PJONE">
</span>
<header class="post-header">
<h1 class="post-title" itemprop="name headline">
<a href="/2019/12/17/jq-load/" class="post-title-link" itemprop="url">解决jquery.load加载文件的CORS跨域问题</a>
</h1>
<div class="post-meta">
<span class="post-time">
<span class="post-meta-item-icon">
<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2019-12-17 19:32:53" itemprop="dateCreated datePublished" datetime="2019-12-17T19:32:53+08:00">2019-12-17</time>
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-calendar-check-o"></i>
</span>
<span class="post-meta-item-text">更新于</span>
<time title="修改时间：2019-12-27 12:10:44" itemprop="dateModified" datetime="2019-12-27T12:10:44+08:00">2019-12-27</time>
</span>
<span class="post-category">
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-folder-o"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/JS/" itemprop="url" rel="index"><span itemprop="name">JS</span></a></span>
</span>
<div class="post-symbolscount">
<span class="post-meta-item-icon">
<i class="fa fa-file-word-o"></i>
</span>
<span class="post-meta-item-text">本文字数：</span>
<span title="本文字数">1.1k</span>
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-clock-o"></i>
</span>
<span class="post-meta-item-text">阅读时长 ≈</span>
<span title="阅读时长">1 分钟</span>
</div>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<div class="note ">
<p>最近做的演示系统，需要有导入本地SVG文件的功能，因为项目用到了jquery，所以使用jquery的load功能，然而出现了CORS跨域问题。 </p>
</div>
<!--noindex-->
<div class="post-button text-center">
<a class="btn" href="/2019/12/17/jq-load/#more" rel="contents">
阅读全文 »
</a>
</div>
<!--/noindex-->
</div>
<footer class="post-footer">
<div class="post-eof"></div>
</footer>
</div>
</article>
<article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
<div class="post-block">
<link itemprop="mainEntityOfPage" href="http://blog.captainp.cn/2019/12/01/2darray/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="name" content="PJONE">
<meta itemprop="description" content="PJONE的博客">
<meta itemprop="image" content="/images/captain.jpg">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="PJONE">
</span>
<header class="post-header">
<h1 class="post-title" itemprop="name headline">
<a href="/2019/12/01/2darray/" class="post-title-link" itemprop="url">用.fill创建和初始化JS二维数组</a>
</h1>
<div class="post-meta">
<span class="post-time">
<span class="post-meta-item-icon">
<i class="fa fa-calendar-o"></i>
</span>
<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2019-12-01 23:47:23" itemprop="dateCreated datePublished" datetime="2019-12-01T23:47:23+08:00">2019-12-01</time>
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-calendar-check-o"></i>
</span>
<span class="post-meta-item-text">更新于</span>
<time title="修改时间：2019-12-02 00:04:05" itemprop="dateModified" datetime="2019-12-02T00:04:05+08:00">2019-12-02</time>
</span>
<span class="post-category">
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-folder-o"></i>
</span>
<span class="post-meta-item-text">分类于</span>
<span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/JS/" itemprop="url" rel="index"><span itemprop="name">JS</span></a></span>
</span>
<div class="post-symbolscount">
<span class="post-meta-item-icon">
<i class="fa fa-file-word-o"></i>
</span>
<span class="post-meta-item-text">本文字数：</span>
<span title="本文字数">473</span>
<span class="post-meta-divider">|</span>
<span class="post-meta-item-icon">
<i class="fa fa-clock-o"></i>
</span>
<span class="post-meta-item-text">阅读时长 ≈</span>
<span title="阅读时长">1 分钟</span>
</div>
</div>
</header>
<div class="post-body" itemprop="articleBody">
<h1 id="问题描述"><a href="#问题描述" class="headerlink" title="问题描述"></a>问题描述</h1><p>现想创建一个n*n大小的二维数组，但是不想用for循环。然后想到了JS数组中的fill，自然地写下下面的代码。</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">n = <span class="number">3</span></span><br><span class="line"><span class="keyword">let</span> arr = <span class="keyword">new</span> <span class="built_in">Array</span>(n).fill(<span class="keyword">new</span> <span class="built_in">Array</span>(n).fill(<span class="number">0</span>))</span><br><span class="line">arr[<span class="number">1</span>][<span class="number">1</span>] = <span class="number">1</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">我们想要的结果是</span></span><br><span class="line"><span class="comment">[0, 0, 0]</span></span><br><span class="line"><span class="comment">[0, 1, 0]</span></span><br><span class="line"><span class="comment">[0, 0, 0]</span></span><br><span class="line"><span class="comment">然而实际的结果是</span></span><br><span class="line"><span class="comment">[0, 1, 0]</span></span><br><span class="line"><span class="comment">[0, 1, 0]</span></span><br><span class="line"><span class="comment">[0, 1, 0]</span></span><br><span class="line"><span class="comment">*/</span></span><br></pre></td></tr></table></figure>
<p>用的时候出现不符合预期的结果。原来问题出现在<strong>Array.fill</strong>这个方法中，<strong>当一个对象被传递给fill方法中，填充数组的是这个对象的引用</strong>。也就是说，上面的例子是，给最外层的数组填充的是<strong>同一个新数组的引用</strong>，因此，修改了arr[1][1]会导致每行的第2个元素会被修改。</p>
<h1 id="解决方案"><a href="#解决方案" class="headerlink" title="解决方案"></a>解决方案</h1><p>使用map, 每次返回新的数组的引用，基本类型时再用fill初始化。<br><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">n = <span class="number">3</span></span><br><span class="line"><span class="keyword">let</span> arr = <span class="keyword">new</span> <span class="built_in">Array</span>(n).fill(undefine).map(<span class="function"><span class="params">()</span> =></span> <span class="keyword">new</span> <span class="built_in">Array</span>(n).fill(<span class="number">0</span>))</span><br></pre></td></tr></table></figure></p>
</div>
<footer class="post-footer">
<div class="post-eof"></div>
</footer>
</div>
</article>
<article class="post post-type-normal" itemscope itemtype="http://schema.org/Article">
<div class="post-block">
<link itemprop="mainEntityOfPage" href="http://blog.captainp.cn/2019/11/04/optimize/">
<span hidden itemprop="author" itemscope itemtype="http://schema.org/Person">
<meta itemprop="name" content="PJONE">
<meta itemprop="description" content="PJONE的博客">
<meta itemprop="image" content="/images/captain.jpg">
</span>
<span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization">
<meta itemprop="name" content="PJONE">
</span>
<header class="post-header">
<h1 class="post-title" itemprop="name headline">
<a href="/2019/11/04/optimize/" class="post-title-link" itemprop="url">前端优化</a>
</h1>
<div class="post-meta">
<span class="post-time">