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deepcopy.html
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deepcopy.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
let obj = {
a: 10,
b: function () {},
c: /\d$/,
d: new Date(),
e: [10, [100, 200]],
f: {
x: 1,
y: 2
},
g: undefined,
h: null
}
let deepCopy = (obj) => {
if (obj === null) {
return null
}
if (typeof obj !== 'object') {
return obj
}
if (obj instanceof RegExp) {
return new RegExp(obj)
}
if (obj instanceof Date) {
return new Date(obj)
}
let newObj = new obj.constructor
for (let key in obj) {
if (obj.hasOwnProperty(key)) {
newObj[key] = deepCopy(obj[key])
}
}
return newObj
}
let newObj = deepCopy(obj)
console.log(obj)
console.log(newObj)
</script>
</body>
</html>