更改按钮文本 onclick

问题描述

当我单击 myButton1 按钮时，我希望将值从 Open Curtain 更改为 Close Curtain.
HTML:

When I click on myButton1 button, I want the value to change to Close Curtain from Open Curtain.
HTML:

<input onclick="change()" type="button" value="Open Curtain" id="myButton1"></input>

Javascript:

function change();
{
    document.getElementById("myButton1").value="Close Curtain";
}

按钮现在显示打开的窗帘，我希望它更改为关闭窗帘，这是正确的吗?

The button is displaying open curtain right now and I want it to change to close curtain, is this correct?

推荐答案

如果我正确理解了您的问题，您想在Open Curtain"和Close Curtain"之间切换——如果它已关闭，反之亦然.如果这就是您所需要的，这将起作用.

If I've understood your question correctly, you want to toggle between 'Open Curtain' and 'Close Curtain' -- changing to the 'open curtain' if it's closed or vice versa. If that's what you need this will work.

function change() // no ';' here
{
    if (this.value=="Close Curtain") this.value = "Open Curtain";
    else this.value = "Close Curtain";
}

请注意，您不需要在更改中使用 document.getElementById("myButton1")，因为它是在 myButton1 的 上下文 中调用的代码>——我所说的上下文是什么意思，你将在阅读有关 JS 的书籍后了解.

Note that you don't need to use document.getElementById("myButton1") inside change as it is called in the context of myButton1 -- what I mean by context you'll come to know later, on reading books about JS.

更新:

我错了.不像我之前说的那样，this 不会引用元素本身.你可以使用这个:

I was wrong. Not as I said earlier, this won't refer to the element itself. You can use this:

function change() // no ';' here
{
    var elem = document.getElementById("myButton1");
    if (elem.value=="Close Curtain") elem.value = "Open Curtain";
    else elem.value = "Close Curtain";
}

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