JS prototype property

The prototype property gives you the ability to add properties and methods to an object.

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script type="text/javascript">
//Add a property or method to the custom object
function employee(name,job,born){
	this.name=name;
	this.job=job;
	this.born=born;
}

var bill=new employee("Bill Gates","Engineer",1985);
employee.prototype.salary=null;
bill.salary=20000;

document.write(bill.salary);
</script>
</body>
</html>

Effect picture:

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script type="text/javascript">
//Add a property or method to the built-in object
Date.prototype.format = function(str) {
    var Week = ['Day', 'One', 'Two', 'Three', 'Four', 'Five', 'Six'];
    str = str.replace(/yyyy|YYYY/, this.getFullYear());
    str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100));
    str = str.replace(/MM/, (this.getMonth() + 1) > 9 ? (this.getMonth() + 1).toString() : '0' + (this.getMonth() + 1));
    str = str.replace(/M/g, (this.getMonth() + 1));
    str = str.replace(/w|W/g, Week[this.getDay()]);
    str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate());
    str = str.replace(/d|D/g, this.getDate());
    str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours());
    str = str.replace(/h|H/g, this.getHours());
    str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes());
    str = str.replace(/m/g, this.getMinutes());
    str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds());
    str = str.replace(/s|S/g, this.getSeconds());
    return str;
}
var now = new Date();
console.info(now.format("yyyy-MM-dd hh:mm:ss"));
console.info(now.format("yy-M-d h:m:s 星期W"));

</script>
</body>
</html>

Effect picture:

JS prototype property

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