JS Learning Note 2---HTML property operations

1.HTML Property Manipulation: Read, write

Property name

Property value

2. Property read operation: Get, find

A) Syntax: element. Property name

such as: document.getElementById ("BTN"). Value;

b) connection of strings: +

3. Property write Operation: ("Add") Replace, modify

A) Syntax: element. property name = new value

such as: document.getElementById ("BTN"). Value = "Well, Coax ~ change Change";

4 . Element content operations:("add") Replace, modify

op.innerhtml Read all HTML content within an element

op.innerhtml = new value Replace all HTML content within the element

5.a=a+b =====> a+=b

6. Read and write operation precautions:

Note Reserved words and keywords

a) reserved word: Class ...

b) Keywords: var, function,...

Precautions

A) do not judge all the relative paths!

b) Color values do not take to make judgments!

c) InnerHTML do not take it for judgment!

7. How to use the "[]":

ODiv.style.width = Obtn1.value; The following values cannot be changed.

Odiv.style[width] = Obtn1.value; [] The value inside can be changed

JS allows the " . " become " []", such as Obtn.onclick ===> obtn['onclick']

JS Learning Note 2---HTML property operations