Day37 JS note motion function 2021.10.11

Mouse events ：

mouseover/mouseout The bound event moves into the event , Child elements also trigger

mouseenter/mouseleave The bound event moves into the event , Child elements do not trigger

trycatch grammar ：（ Adjustable trial ）

try {} catch (error) {}

-- Execute first try Later code , If no error is reported, then , end ; If try Syntax error in code in , The browser will not report an error , Send the error message to error Parameters , And then execute catch The code in

Get the property name method in the object ：Object.keys( object )

Return value ： An array of all the attribute names of an object

DOM Animation effect ：

Three elements of sports ：1） The starting point    2） The goal is     3） Speed

1） Let an element move from left to right

2） Motion termination ：

DOM Animation effect encapsulation

Single attribute motion frame :