[英]Javascript function define
I'm currently new to javascript programming. 我目前是javascript编程的新手。 And I have a question about function. 我对功能有疑问。 When I tried to modify html DOM. 当我尝试修改html DOM时。 I could either use function or no function. 我可以使用功能,也可以不使用功能。
The function one is as below: 功能一如下:
<button type="button" onclick="myFunction()">Click Me!</button>
<p id="demo">This is a demonstration.</p>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = "Hello";
}
And the no function one is here: 这里没有功能:
<p id="demo">This is a demonstration.</p>
<button type="button" onclick= "getElementById('demo').innerHTML= 'Hello'">Click Me! </button>
My question is :Why there it is document.getElementById()... in function case , but getElementById() in non function case? 我的问题是:为什么在函数情况下为document.getElementById()...在非函数情况下为getElementById()? What's the document. 什么文件。 for? 对于?
Thanks!! 谢谢!!
What's the document. 什么文件。 for? 对于?
To access the document
object , where the getElementById
method resides. 要访问document
对象 , getElementById
方法所在。
Why there it is document.getElementById()... in function case , but getElementById() in non function case? 为什么在函数情况下有document.getElementById()...在非函数情况下有getElementById()?
It should always be there. 它应该一直在那里。 In the inline event handler case, it can be omitted however (which is considered bad practise, though). 在内联事件处理程序的情况下, 可以将其省略 (不过,这被认为是不好的做法)。
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