new object的obj对象得到啥
<!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>object</title> </head> <body> <script> var obj={} obj.a=1; var newObj=new Object(obj) console.log(newObj===obj)//true //引用值 ->object.prototype </script> </body> </html>
new object的数组得到啥
<!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>object</title> </head> <body> <script> // var obj={} // obj.a=1; // var newObj=new Object(obj) // console.log(newObj===obj)//true //引用值 ->object.prototype var arr=[1,2,3,4] var newArr=new Object(arr) console.log(newObj===obj)//true </script> </body> </html>
new arr+数组
<!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>object</title> </head> <body> <script> // var obj={} // obj.a=1; // var newObj=new Object(obj) // console.log(newObj===obj)//true //引用值 ->object.prototype var arr=[1,2,3,4] var newArr=new Array(arr) console.log(newObj===obj)//false </script> </body> </html>
原始值不能添加属性
<!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>object</title> </head> <body> <script> // var obj={} // obj.a=1; // var newObj=new Object(obj) // console.log(newObj===obj)//true //引用值 ->object.prototype // var arr=[1,2,3,4] // var newArr=new Array(arr) // console.log(newObj===obj)//false //基本值 var a=1 a.b=2; console.log(a.b) </script> </body> </html>
