val()可以获取或设置元素的value属性值。语法如下：
示例：
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<meta name="viewport" content="width=device-width, initial-scale=1.0"> ???<meta http-equiv="X-UA-Compatible" content="ie=edge"> ???<title>value值操作演示示例</title> ???<style> ??????*{ ??????????margin-left: 10px; ??????????padding: 0px; ??????} ??????input{ ??????????display: block; ??????????float: left; ??????} ???</style> ???<!--引入jQuery--> ???<script src="../jquery-3.3.1.js"></script> ???<!--javascript--> ???<script> ??????$(function(){ ???????????$("#btnGet").click(function(){ ???????????????var val=$("input[type=‘text‘]").val(); ???????????????alert("value值:"+val); ????????????}); ????????????$("#btnSet").click(function(){ ???????????????var html=$("input[type=‘text‘]").val("设置value值"); ????????????}); ??????}); ???</script></head><body> ???<input type="text" style="display:block;margin-bottom: 10px;" /> ???<input type="button" id="btnGet" value="获取val()值" style="margin-right:10px;" /> ???<input type="button" id="btnSet" value="设置val()值" /></body></html>效果：
jQuery（六）：value值操作
原文地址：https://www.cnblogs.com/dotnet261010/p/9735314.html