js无法获得相应元素的值

Question

我通过js代码对input标签的内容进行取值，可是js就是报错说变量未定义，我检查了好几遍都没检查出到底哪里错了，求指导。代码如下      <td width="72"></td>         <td width="72">确认密码</td>         <td width="272"><label>             <input name="new_pwd_again" type="password"                    onkeyup="validate()"                    placeholder=" * 为必填项"                    required                    value="dsf"             />             <font name="tishi">das</font>         </label></td>js中：function validate() {    var pwd=document.getElementsByName("new_pwd_again").value;

Answer 1

你需要多多学习一下document.getElementsByName("new_pwd_again")获得的是多个哦 应该是
var pwd=document.getElementsByName("new_pwd_again")[0].value;