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body.style.width = innerWidth - 300 + "px";
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<style>
#nav{position: fixed;
width:250px;
height: 100%;
border-left:solid 1px silver;
right: 0;line-height:1.4em;
top: 0;overflow:auto;
padding: 5px;}
#nav .h1,#nav .h2,#nav .h3,#nav .h4,#nav .h5,#nav .h6{
font-size:1em;border:none;color:black;text-align:left;
display:block; text-decoration: none;
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#nav .h1{text-indent:0em}
#nav .h2{text-indent:1em}
#nav .h3{text-indent:2em}
#nav .h4{text-indent:3em}
#nav .h5{text-indent:4em}
#nav .h6{text-indent:5em}
</style>
<div id="nav" ></div>`)
let arr = document.querySelectorAll("h1,h2,h3,h4,h5,h6");
let str = "";
arr.forEach((item, index) => {
str += `<a class="${item.tagName}" href="#toc_${index}">├ ${item.innerText}</a>`
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body {
background-color: #efefef;
-ms-text-size-adjust: 100%;
-webkit-text-size-adjust: 100%;
font-size: .8em;
line-height: 1.7em;
color: #24292e;
font-family: 'Microsoft YaHei', Serif;
word-wrap: break-word;
}
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote {
margin: 0;
padding: 0;
}
a {
color: #0069d6;
}
a:hover {
color: #005093;
text-decoration: none;
}
a img {
border: none;
}
img {
width: auto;
max-width: 100%;
display: block;
}
img:after {
content: "";
display: block
}
p {
margin: 1.7em 0;
text-indent: 2em;
}
h1,
h2,
h3,
h4,
h5,
h6 {
color: #333;
line-height: 1.5em;
margin: 0.3em 0;
padding: 0.2em;
}
h1 {
font-size: 34px;
text-align: center;
color: #218868;
text-indent: 0;
border-bottom: dotted 5px silver;
}
h2 {
text-indent: .5em;
font-size: 24px;
border-left: #218868 solid 8px;
border-bottom: solid 1px silver;
}
h3 {
font-size: 18px;
color: #218868; border-bottom: #218868 solid 2px;
text-indent: 0.5em;
}
h4 {
font-size: 16px;
color: #117858;border-bottom: #218868 dashed 2px;
text-indent: 1em;
}
h5 {
font-size: 14px;
color: #117858;border-bottom: #218868 dotted 1px;
text-indent: 2em;
}
h6 {
font-size: 13px;
color:#efefef;
background-color: #117858;
text-indent: 2em;
}
hr {
margin: 0 0 19px;
border: 0;
border-bottom: 1px solid #ccc;
}
blockquote {
border: solid 10px #cccccc;
background: #f3f3f3;
padding: 0;
font-style: italic;
border-radius: 5px;
}
blockquote p {
font-size: 14px;
line-height: 1.5em;
margin: 0;
font-style: italic;
padding: .5em 1em;
text-indent: 0;
color: blue;
background-color: #e4e4e4;
}
code,
pre {
font-family: Monaco, Andale Mono, Courier New, monospace;
}
code {
padding: 3px 10px;
font-size: 14px;
border-bottom: dotted #559966 1px
}
pre {
display: block;
padding: 0.2em 1em;
background-color: #e4e4e4;
font-size: 14px;
border-left: 10px solid #cccccc;
white-space: pre-wrap;
word-wrap: break-word;
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pre code {
border: none;
font-family: Monaco, Andale Mono, Courier New, monospace;
font-size: 14px;
padding: 0;
line-height: 30px;
color: darkblue;
}
table {
width: 100%;
border-collapse: collapse;
border-spacing: 0;
background: white;
font-size: 14px;
border-radius: 3px;
}
table th {
border-bottom: 2px solid #ddd;
vertical-align: bottom;
padding: 8px;
text-align: center;
}
table td {
border-top: 1px solid #ddd;
padding: 8px;
vertical-align: top;
}
table>tbody>tr:nth-child(odd)>td,
.table>tbody>tr:nth-child(odd)>th {
background-color: #f9f9f9;
}
table th,
table td {
border: solid 1px #ddd;
}
table th {
border-bottom: 2px solid #ddd;
}
table>tbody>tr:hover>td,
.table>tbody>tr:hover>th {
background-color: #f5f5f5;
}
table th,
.table td {
padding: 5px;
}