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This article mainly introduces the common methods of string cutting in js. It is very detailed and has a certain reference value. Friends who are interested must finish reading it.

I. Slice1. Two parameters:

Two parameters: start index (start position), end index (end position), extract a part of the string and return the extracted part in the new string.

Before and after the bag is not covered.

Var str= "HelloTwd"; / / slice method / / two parameters: start index (start position) and end index (end position). / / extract a part of the string and return the extracted part in the new string. / / var res=str.slice (1) before and after package (1); console.log (res)

two。 Parameter is negative:

If a parameter is negative, the count starts at the end of the string and does not precede the package.

Var str= "HelloTwd"; / / if a parameter is negative, the count starts at the end of the string. / / var res1=str.slice before the package is not available (1mam talk 5) console.log (res1)

3. One parameter:

If the second parameter is omitted, the method will trim the rest of the string, and before the package, if the parameter is negative, count from the end, including the characters at the position of the trimmed value.

Var str= "HelloTwd"; / / if the second argument is omitted, the method will trim the rest of the string: / / pre-package var res2=str.slice (5) console.log (res2); / / count from the end, including the character var res3=str.slice (- 5) console.log (res3) where the value is trimmed

4. Note:

If it is positive, the index starts at 0, and if it is negative, the index starts at-1, that is, index 1 at the end, not 0.

II. Substring1. Two parameters:

Substring () is similar to slice (), except that substring () cannot accept negative indexes. Before and after the bag.

Var str= "HelloTwd" / / substring () is similar to slice (). / / the difference is that substring () cannot accept a negative index. / / var res=str.substring (1) console.log (res) before and after package

two。 One parameter:

If the second argument is omitted, the substring () will trim the rest of the string before the package.

Var str= "HelloTwd" / / if the second argument is omitted, the substring () will crop the rest of the string. / / pre-package var res1=str.substring (5) console.log (res1)

3. Note:

If negative, the entire string is returned.

Var str= "HelloTwd" / / if negative, the entire string var res3=str.substring (- 2) console.log (res3) is returned.

Three. Sbustr1. Two parameters:

Substr () is similar to slice (), except that the second parameter specifies the length of the extracted part. Before the package is not included

Var str= "HelloTwd" / / substr () is similar to slice (). / / the difference is that the second parameter specifies the length of the extracted part. / / var res=str.substr (1pc6) console.log (res) before no package

When it is a negative number, including the characters at the clipped value.

Var str= "HelloTwd" / / is negative / / includes the character var res1=str.substr (- 2pj2) console.log (res1) at the cropped numeric value

two。 One parameter:

* * if the second parameter is omitted, the substr () will trim the rest of the string, including numeric characters to be separated. **

Var str= "HelloTwd" / / if the second argument is omitted, the substr () will crop the rest of the string. / / include numeric characters to be separated, var res2=str.substr (- 5) console.log (res2)

3. Note:

Does not output content beyond the index

These are all the contents of this article entitled "what are the common ways to cut strings in js?" Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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