javascript - String.slice和String.substring有什么区别？(What is the difference between String.slice and String.substring?)

Question

Does anyone know what the difference is between these two methods:

(有谁知道这两种方法之间的区别是什么：)

String.protorype.slice
String.protorype.substring

  ask by tmim translate from so

Answer 1

slice() works like substring() with a few different behaviors.

(slice()工作方式类似于substring() ，但有一些不同的行为。)

Syntax: string.slice(start, stop);
Syntax: string.substring(start, stop);

What they have in common:

(他们有什么共同点：)

1. If start equals stop : returns an empty string

   (如果start equals stop ：返回一个空字符串)

2. If stop is omitted: extracts characters to the end of the string

   (如果省略stop ：将字符提取到字符串的末尾)

3. If either argument is greater than the string's length, the string's length will be used instead.

   (如果任一参数大于字符串的长度，则将使用字符串的长度。)

Distinctions of substring() :

(substring() 区别 ：)

1. If start > stop , then substring will swap those 2 arguments.

   (如果start > stop ，那么substring将交换这两个参数。)

2. If either argument is negative or is NaN , it is treated as if it were 0 .

   (如果任一参数为负数或为NaN ，则将其视为0 。)

Distinctions of slice() :

(slice() 区别 ：)

1. If start > stop , slice() will return the empty string.

   (如果start > stop ， slice()将返回空字符串。)

   ( "" )

   (（ "" ）)

2. If start is negative: sets char from the end of string, exactly like substr() in Firefox.

   (如果start为负数：从字符串末尾设置char，与Firefox中的substr()完全相同。)

   This behavior is observed in both Firefox and IE.

   (在Firefox和IE中都观察到此行为。)

3. If stop is negative: sets stop to: string.length – Math.abs(stop) (original value), except bounded at 0 (thus, Math.max(0, string.length + stop) ) as covered in the ECMA specification .

   (如果stop为负：将stop设置为： string.length – Math.abs(stop) （原始值），除了以0为界（因此， Math.max(0, string.length + stop) ），如ECMA规范中所述 。)

Source: Rudimentary Art of Programming & Development: Javascript: substr() vs substring()

(来源： 编程与开发的基础艺术：Javascript：substr（）vs substring（）)