<!DOCTYPE html><html><head> ???<meta charset="utf-8"> ???<meta http-equiv="X-UA-Compatible" content="IE=edge"> ???<title>自动选择</title> ???<link rel="stylesheet" href=""></head><body> ???<h1>focus时自动选中内容</h1> ???<input type="text" autoselect start="2" end="4" value="这是内容这是内容这是内容"> ???<br><br> ???<textarea autoselect>这是内容这是内容这是内容</textarea> ???<!-- 引入jquery --> ???<script ?????src="https://code.jquery.com/jquery-3.3.1.min.js" ?????integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" ?????crossorigin="anonymous"></script> ???<script> ???/** ????* 自动选择文本框/文本域中的内容 ????* @param ?{dom} e [必填，必须是input或者textarea] ????* @param ?{开始索引值} s [默认:0] ????* @param ?{[type]} t [默认：总长度] ????* @return {[type]} ??[null] ????*/ ???function autoselect(e,s,t){ ???????var startIndex = s ? Number(s) : 0; ???????var stopIndex = t ? Number(t) : $(e).val().length; ???????if (e.setSelectionRange) { ???????????e.setSelectionRange(startIndex, stopIndex); ???????} else if (e.createTextRange) { ???????????var range = e.createTextRange(); ???????????range.collapse(true); ???????????range.moveStart(‘character‘, startIndex); ???????????range.moveEnd(‘character‘, stopIndex - startIndex); ???????????range.select(); ???????} ???????e.focus(); ???} ???$("[autoselect]").on("focus",function(e){ ?????var start = $(this).attr("start"); ?????var end = $(this).attr("end"); ?????autoselect(this, start , end); ???}); ???</script></body></html>效果：
js 文本框文本域focus时自动选中内容
原文地址：https://www.cnblogs.com/mankii/p/9957058.html