2019独角兽企业重金招聘Python工程师标准>>> 
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<body>
<script type="text/javascript">
function setCaret(textObj) {
if (textObj.createTextRange) {
textObj.caretPos = document.selection.createRange().duplicate();
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function insertAtCaret(textObj, textFeildValue) {
if (document.all) {
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var tempStr1 = textObj.value.substring(0, rangeStart);
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alert("This version of Mozilla based browser does not support setSelectionRange");
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<p>
<textarea name="tarea" rows="" cols="" style="width:300px;height:120px;"
οnselect="setCaret(this);"
οnclick="setCaret(this);"
οnkeyup="setCaret(this);" >例子例子例子例子例子</textarea>
<br/><br/>
<input type="text" name="textfield" style="width:220px;" value="插入FireFox"/>
<br/>
<input type="button" value="插入"
οnclick="insertAtCaret(this.form.tarea,this.form.textfield.value);"/>
</p>
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<div id="box" contenteditable="true" style="border:1px solid #ccc; width:300px; height:200px;">sljfldjfldf</div>
</body>
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