<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <script> window.onload = function() { var oForm = document.getElementById('form1'); //var oText = document.getElementById('text1'); //获取表单中一个元素 表单.元素name document.onclick = function() { //alert(oText.value); alert( oForm.username.value ); } } </script> </head> <body> <form id="form1"> <input type="text" id="text1" name="username" value="" /> </form> </body> </html>
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <script> window.onload = function() { var oForm = document.getElementById('form1'); var oBtn = document.getElementById('btn'); //onchange : 当值发生改变的时候触发 //text : 当光标离开元素的时候再去判断值是否发生了变化，如果发生了变化则触发onchange事件 /*oForm.username.onchange = function() { alert('值变了'); }*/ /*oForm.sex[0].onchange = function() { alert(1); }*/ for (var i=0; i<oForm.aihao.length; i++) { oForm.aihao[i].onchange = function() { //alert(1); if (this.checked) { alert('你选择了：' + this.value); } else { alert('你取消了：' + this.value); } } } oForm.city.onchange = function() { alert(this.value); } } </script> </head> <body> <form id="form1"> <input type="text" name="username" /> <input type="radio" name="sex" value="男" />男 <input type="radio" name="sex" value="女" checked />女 <input type="checkbox" name="aihao" value="电影" />电影 <input type="checkbox" name="aihao" value="音乐" />音乐 <input type="checkbox" name="aihao" value="体育" />体育 <select name="city" value=""> <option>请选择一个城市</option> <option value="北京">北京</option> <option value="上海" selected>上海</option> <option value="广州">广州</option> <option value="深圳">深圳</option> </select> <input type="button" value="按钮" id="btn" /> <input type="submit" value="提交" /> </form> </body> </html>