<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title></title> </head> <body> <input id="txt" type="text" /> <input id="btn" type="button"/> <script> var oTxt = document.getElementById(‘txt‘ ); var oBtn = document.getElementById(‘btn‘); oBtn.onclick = function () { // oTxt.value = ‘defdi‘; // oTxt[‘value‘] = ‘deidi‘; oTxt.setAttribute(‘value‘,‘dieid‘); }; </script> </body> </html>
原文：http://www.cnblogs.com/zhuni/p/4709380.html