1、示例代码
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>hasOwnProperty使用</title>
</head>
<body>
<script type="text/javascript">
let dict = {
name: 'mfg'
}
console.log(dict.hasOwnProperty('name'));
let dictNew = {
name: 'mfg',
hasOwnProperty: 10
}
//报错 dictNew.hasOwnProperty is not a function
//因为dictNew 修改了hasOwnProperty的实现
//console.log(dictNew.hasOwnProperty('name'));
let hasOwn = Object.prototype.hasOwnProperty;
console.log(hasOwn.call(dictNew, 'name'))
</script>
</body>
</html>
2、说明
(1) 在使用hasOwnProperty方法时,最好使用Object.prototype.hasOwnProperty.call方式(推荐!!),以防止对象对hasOwnProperty方法重新实现。
(2) 写法:
Object.prototype.hasOwnProperty === [].hasOwnProperty