Summary of JavaScript knowledge points: functions and events

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JavaScript function With events

1. Custom function

<script>
	function 函数名(形参1,形参2，形参n){
			语句		}</script>

The sample is as follows:

	<script>
		function getArea(width,heigt){
			var resule=width*heigt;
			document.write("面积为："+resule);
		}
	</script>
		<script>
			getArea(3,4)
		</script>
		
	

2.JavaScript system function

• parseInt() Convert the string to an integer
• parseFloat() Convert the string to a decimal
• isNaN() Determine whether it is NaN (number)
• eval() runs the js code formed as a string and returns the execution result

##eval example:

 
	<script>
		function getArea(){
			var a=1;
			var b=2;
			var resule=eval(a+b);
			alert(resule);
		}
	</script>
		<script>
			getArea()
		</script>
		
	

2 .JavaScript event Page event:
onload() Page loading
onblur() Lose focus
onfocus() Gain focus
onchange() Input box changes
Mouse Event:
onclick() click
onmousedown() mouse move in
onmouseout() mouse move out
onmousemove() mouse move
Keyboard event:
onkeypress()
Form event :
onsubmit()

onload example:

 
	<script>
			window.onload=function(){
				alert("页面加载完成")
			}
		</script>	
	

JavaScript Browser Object Model

window() Top-level object hostory() browser record object
location() address object
document() document object

location() properties and methods

window( ) method

window() attribute

navigator() method

navigator() attribute

screen() attribute

history() method

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