http://www.good1230.com/detail/2022-01-22/575.html

• 1、引用 https://highlightjs.org/static/demo/styles/default.css
• 2、引用 https://highlightjs.org/static/highlight.site.pack.js
• 3、调用 hljs.highlightAll() 函数

• https://www.npmjs.com/package/pdfjs-dist
• https://github.com/mozilla/pdf.js
• 点击以下链接下载web/viewer.html包（注：本人使用git下载无法预览）
• https://mozilla.github.io/pdf.js/getting_started/#download

https://github.com/alienzhou/web-highlighter

let dom = document.querySelector('textarea')
    dom.onkeydown = function(e){
        console.log(e.key)
        console.log(e.code)
        console.log(e.keyCode)

    if(e.keyCode == 13){
        e.returnValue = false
        console.log('禁用enter事件')
    }
}

<iframe id="pdf" name="pdf" 
      src="static/web/viewer.html?file=compressed.tracemonkey-pldi-09.pdf" 
      style="width:100%; height:500px">
</iframe>

<div id="text">good1230.com-专注于网站排名优化博客建站系统和好文分享</div>

let context = document.getElementById("text")
context.addEventListener('mouseup',() => {
    const selection = window.getSelection()
    const text = selection.toString()
})

字符串转数组split() 函数和数组转字符串join() 函数实例

var string="abcdefg"
console.log(string.split(''));
// 输出结果：["a", "b", "c", "d", "e", "f", "g"]

var array=["a", "b", "c", "d", "e", "f", "g"];
console.log(array.join(','));
// 输出结果：a,b,c,d,e,f,g