Question

我在Arduino中使用了此代码，但我不知道此onmousedown如何工作以及此代码中的location.href=/?off13是什么意思：

client.println("<input type=button value=OFF style='width:150px' onmousedown=location.href='/?off13;'>");
if(readString.indexOf('12') >0)//checks for 6
{
    digitalWrite(7, HIGH);    // set pin 7 high
    Serial.println("Led 7 On");
}

if(readString.indexOf('13') >0)//checks for 7
{
    digitalWrite(7, LOW);    // set pin 7 low
    Serial.println("Led 7 Off");
}

Answer 1

当用户在元素上按下鼠标按钮时，会发生onmousedown事件。

<p onmousedown="myFunction()">Click the text!</p>

The onmousedown attribute is similar to the onclick attribute, but differs in that the event is triggered the moment the mouse button is pressed on the element, rather than at the point at which the mouse button is released (onclick is effectively a combination of onmousedown and onmouseup event on the element)

href属性设置或返回当前页面的整个URL。

location.href=URL

Answer 2

以下链接对您了解OnMouseDown事件非常有用：

click, mousedown, mouseup, dblclick

祝你好运....

在您的代码中，location.href=/?off13将值13传递给查询字符串...

是什么意思onmousedown？

2 个答案: