When are the symbols () [] {}<> ""./= in JavaScript used? What does it mean? I have a detailed introduction in that book. Please recommend it.

& Amp; lt; script & amp; gt; functionchangeImage () What does this parentheses mean? {Why is an equal sign used in element? Document. Why is it used here? GetElementById (& #039; myimage & #039;) Since brackets are used, why do we need to use quotation marks? If (element. Why is there... script
Function changeImage () What does this parentheses mean?
{
Element = Why is the equal sign used here?Document. Why do we use vertices here?GetElementById ('myimage ') Since brackets are used, why do we need to use quotation marks?
If (element. Why do spaces are used directly in some places, but vertices are used in this place?Src. match ("bulbon "))
{
Element. src = "/I/eg_bulboff.gif ";
}
Else
{
Element. src = "/I/eg_bulbon.gif ";
}
}
Script

Do these symbols have a book to detail their definition.

Reply content:

Script
Function changeImage ()What does this parentheses mean?
{
Element =Why is the equal sign used here?Document.Why do we use vertices here?GetElementById ('myimage ')Since brackets are used, why do we need to use quotation marks?
If (element.Why do spaces are used directly in some places, but vertices are used in this place?Src. match ("bulbon "))
{
Element. src = "/I/eg_bulboff.gif ";
}
Else
{
Element. src = "/I/eg_bulbon.gif ";
}
}
Script

Do these symbols have a book to detail their definition.

You are not getting started with the syntax. Get a rhino book first.
Https://book.douban.com/subject/10549733/

Let's get into the door first, especially the theory. Don't think about learning with the video. You need to understand the reason for this.