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4. Basic type and reference type?

2022-07-24 18:21:00 【yingxingyf】

<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>	
		<input type="button" value="  test  " onclick ="testf()" />	
			
	</body>
</html>
<script type="text/javascript">
	
function testf(){
    
	// Value type ; The value is stored in the memory space corresponding to the variable 
	/*
	var m = 20;
	var n = m;
	n = 50;
	document.write("m="+m);//20
	*/
	
	// Reference type ： The address is stored in the memory space corresponding to the variable （ quote ）
	var arr1=[12,23,34,45];// Equivalent to  var arr1 = new Array(12,23,34,45);
	var arr2 = arr1;
	arr2[2] = 100;
	
	document.write("arr1[2]="+arr1[2]);
	
}
</script>