Javascript three-character processing functions: Split join and replace replaceall

Let's take a look at the example. Copy the code into an HTML file and run it. Then we can understand it:

<SCRIPT Lanuage = "JavaScript">
VaR STR = "abcdemo-chicjkclm ";
VaR strsplitbyc = Str. Split ("C ");
VaR arrayjoinby3 = strsplitbyc. Join ("3 ");
Alert ("arrayjoinby3 =" + arrayjoinby3 );

VaR replaceone = Str. Replace ("C", "3 ");
Alert ("replaceone =" + replaceone );

VaR replaceall = Str. Replace (New Regexp ("C", "GM"), "3 ");
Alert ("replaceall =" + replaceall );
</SCRIPT>

If you run the command, the first output is the same as the third output. Yes, JavaScript does not provide the replaceall function, but to implement this function, it seems that I have provided two methods here! Welcome to the experts who passed by for advice. The younger brother is also a cainiao. Posting it here is just like taking a note. I used to disagree with this Js. I just got a taste of it recently. It seems that there are so many things to learn.

A good Web Development Learning address is also recommended here:W3C School

Split () method

 

Definition and usage

The split () method is used to split a string into a string array.

Syntax

stringObject.split(separator,howmany)

Parameters	Description
Separator	Required. String or regular expression, which separates stringobject from the specified place.
Howmany	Optional. This parameter specifies the maximum length of the returned array. If this parameter is set, no more substrings are returned than the array specified by this parameter. If this parameter is not set, the entire string is split, regardless of its length.

Return Value

A string array. The array isSeparatorSplit the string stringobject into substrings at the specified boundary. The strings in the returned array do not includeSeparatorItself.

 

 

Replace () method

 

Definition and usage

The Replace () method is used to replace other characters with some characters in a string, or replace a substring that matches a regular expression.

Syntax

stringObject.replace(regexp,replacement)

Parameters	Description
Regexp	Required. Specifies the Regexp object of the pattern to be replaced. Note that if the value is a string, it is used as the direct text mode to be retrieved, rather than being converted to a Regexp object first.
Replacement	Required. A string value. Specifies the function for replacing text or generating replacement text.

Return Value

A new string is obtained after the first match of Regexp or all matches are replaced by replacement.

 

 

 

 

 

 

 

Join () method

 

Definition and usage

The join () method is used to put all elements in the array into a string.

Elements are separated by the specified delimiter.

Syntax

arrayObject.join(separator)

Parameters	Description
Separator	Optional. Specifies the delimiter to use. If this parameter is omitted, a comma is used as the separator.

Return Value

Returns a string. This string is used to convert each element of arrayobject into a string, connect these strings, and insert them between two elements.SeparatorString.