javascript

Examples of adding and removing object properties in JavaScript


<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript">

var r=new Object();
alert(typeof(r));
//Add attributes
r.name="jobs";
alert(r.name);
r.getname=function(){
return "jobs";
}
alert(r.getname());
//Delete the properties
delete r.name;
alert(r.name);//The result is undefined
//--------------------------------------------
// Use brackets as objects Add attributes
r["name"]="tom";
alert(r["name"]);

r.name="toms";
alert(r["names"]);
//r.name==r["name"]// These two ways are equivalent
var arg="abc";
r[arg]="heima";//Powerful, can dynamically add properties, can make a function variable return a string
r.arg="itcast";//Arg defaults to a string
</script>
</head>
<body>

</body>
</html>