更改按钮文本的onclick [英] Changing button text onclick

问题描述

当我点击这个按钮，我想要的值来改变。 HTML：

When I click on this button, I want the value to change. HTML:

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

使用Javascript：

Javascript:

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

这个按钮现在显示开放窗帘，我希望它改变关闭窗帘，这是正确的？

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

推荐答案

如果我正确地理解你的问题，你要打开窗帘和关闭窗帘之间进行切换 - 切换到开帷幕如果它的关闭，反之亦然。如果这是你所需要的，这将正常工作。

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，您不需要使用的document.getElementById（myButton1）里面的变化，因为它被称为在背景的 myButton1 - 我的意思背景下，你会晚一点知道，在阅读有关书籍JS

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。还不如我刚才所说，这个将不参考元素本身。您可以使用此：

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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