what length of object

var n = {1:100, 2:101, 3:102, 4:103};How to get the length of this object n?Method One:function GetLength (obj) {var count = 0;for (var i in N) {count++;}return count;}Improvement plus a hasOwnProperty judgment filter the properties in the prototype

In the unity use process, many times will use the length indeterminate object array. An indeterminate array of objects uses the code of the Declaration section. However, as long as it is an array, you have to keep the object in an array of objects,

When using the JScript array, I found a very interesting feature, that is, its built-in object array length can be written. Strange, right? But it's fun. So what will happen if I change its length? When the Length attribute of the array instance

I recently saw some discussions about focal lengths in the forum, so I want to talk about the focal lengths. I hope it will be good for you. If any, please note. The focal length of the camera lens is a very important indicator of the lens. The

In MySQL, what is the maximum length of the varchar type? We will find that the varchar length is 65535 for the varchar data type, that is, 65532 bytes of data can be stored, is that true? Let's take a look. 1. Restrictions Field restrictions

1. Restriction rules The limits of a field have the following rules when the field is defined: A) storage limits The varchar field is to store the actual content separately from the clustered index, where the content begins with 1 to 2 bytes

Example 1:Copy codeThe Code is as follows:Var obj = {0: 'A', 1: 'B '}Alert (obj. length); // undefinedVar arr = ['A', 'B']Alert (arr. length); // 2 As shown in the preceding example, The length attribute in an array object is not directly linked to

ShoneSharp Language (S #) design and use introduction series (7)-Boolean Bool and Object,    ShoneSharp Language (S #) design and use introduction series (7)-Boolean Bool and Object Author: Shone Disclaimer: you are welcome to repost the original

Example 1: Copy codeThe Code is as follows: var obj = {0: 'A', 1: 'B '} Alert (obj. length); // undefined Var arr = ['A', 'B'] Alert (arr. length); // 2 As shown in the preceding example, The length attribute in an array object is not directly

if the setting in an item is varchar (So, of course, the English isSo what about Chinese?Utf-8 in Chinese is 3 bytesSo, does this varchar (50) have only 16 characters to save? No, this is the case with MySQL, but not after 5.0.MySQL varchar (50)