May 29, 2021 Article blog
JavaScript is already well known as the front-end language of the three swordsmen, and today comes with a small summary for novices
JavaScript is a weak type of scripting language that enables web page effects:
1. JS is used as a control structure (HTML) and style (CSS) to achieve web page effects.
2, generally use console .log to detect the code
3. Assign the value on the right to the variable on the left with a """"
4, function definition refers to a certain function of the code block, declaring that the function has no call no effect
5, common data types: String (string), Number (number), Boolean (Boolean), null (empty), undefined (undefined)
6, composite data type: object type object, function type Function array Array
7, the naming rules of variables:
8, events:
| The name of the event | illustrate |
| onclick | Mouse click |
| ondblclick | Double-click with the mouse |
| onkeyup | Triggered when a key on the keyboard is pressed and released |
| onchange | The options in the text content or drop-down menu change |
| onfocus | Gets the focus, which means that the text box gets the mouse cursor |
| onblur | Loss of focus means loss of mouse cursor, such as text boxes |
| onmouseover | Mouse hover, that is, the mouse hovers over the picture and so on |
| onmouseout | Move the mouse out, away from the area where the picture, etc. is located |
| onload | Web document loading event |
| onunload | When you close a Web page |
| onsubmit | Form submission events |
| onreset | Reset the form |
9, familiar with the three major structures: sequential structure, selection structure, cycle structure
10, familiar with and master if, while, for, switch statements, etc.
That's all the little editor brings you about 0 Basics js.