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        JavaScript Element.value 与 Element.getAttribute("value

        时间:2023-09-08

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                  本文介绍了JavaScript Element.value 与 Element.getAttribute("value")的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

                  问题描述

                  我最近开始学习 JavaScript,但有些东西让我感到困惑:

                  I've started learning JavaScript recently but there's something that I'm confused with :

                  Element.value Element.getAttribute("value") ?

                  实际上我的问题是,当我尝试将类型为 textinput 元素的值复制到另一个时,如果我使用第一种方法(Element.value) 它工作正常,但是如果我使用第二种方法它会复制给元素的第一个值,并且当我更改 textbox 内的文本时它永远不会更新,这种行为对我来说似乎很奇怪!你们能解释一下这里发生了什么吗?

                  actually my problem is , when I try to copy the value of an input element with type of text to another one , if I use the first method (Element.value) It works fine but if I go with the second method It copies the first value given to the element and It never gets updated when I change the text inside the textbox , this behavior seems odd to me ! can you guys please explain what's going on here ?

                  <html>
                  <head>
                      <meta charset="utf-8">
                      <title>Hello JavaScript</title>
                      <script src="script2.js"></script>
                  </head>
                  <body>
                      <input id="Text1" type="text" />
                      <input id="Button1" type="button" value="button" />
                      <input id="Text2" type="text" />
                  </body>
                  </html>
                  

                  JavaScript 文件:

                  The JavaScript file :

                  var myButton;
                  
                  window.onload = function () {
                  
                      myButton = document.getElementById("Button1");
                      myButton.onclick = function () {
                          var val = document.getElementById("Text1").getAttribute("value");  
                          //var val = document.getElementById("Text1").value;
                          document.getElementById("Text2").setAttribute("value", val);
                      };
                  
                  };
                  

                  推荐答案

                  不同之处在于 element.value 是实时的,如果用户更改,比如说文本框输入,它将反映,并向您展示新值.

                  The difference is that element.value is real time and if a user changes let's say, a textbox input, it will reflect that, and show you the new value.

                  虽然 getAttribute('value') 仍会显示原始 value="whateverWasHere" 值.

                  While getAttribute('value') will still show the original value="whateverWasHere" value.

                  jsFiddle 演示

                  这篇关于JavaScript Element.value 与 Element.getAttribute("value")的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持html5模板网!

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