如下是一个实例，实现了文本的换行，选中以及滚动到选中文本位置的功能？
<html style='height:100%;'>
<head>
<meta charset='UTF-8' />
</head>
<body style='height:100%;padding:0;margin:0;border-width:0;'>
<div id="content" contenteditable='true' style='height: 100%; width: 100%; white-space: pre-wrap; overflow-y: scroll;'>
</div>
<script>
var str = "xxx";
var div = document.getElementById('content');
div.textContent = decodeURIComponent(str);
</script>
</body>
</html>
var startIndex = 100;
var endIndex = 120;
var range = document.createRange();
var selection = window.getSelection();
var divElement = document.getElementById('content');
range.setStart(divElement.firstChild, startIndex);
range.setEnd(divElement.firstChild, endIndex);
selection.removeAllRanges();
selection.addRange(range);
// 让选定内容滚动到可见区域
var rect = range.getBoundingClientRect();
divElement.scrollTop = rect.top - rect.height;
divElement.focus();
标签：selection,range,html,选中,divElement,文本文件,var,精确定位,document From： https://www.cnblogs.com/nanfei/p/18085940