Question

javascript如何获取一个字符在这个字符串里出现的次数帮帮忙

javascript如何获取一个字符在这个字符串里出现的次数帮帮忙

Answer 1

看看这个函数：

search Method
Returns the position of the first substring match in a regular expression search.

stringObj.search(rgExp)

Arguments
stringObj

Required. The String object or string literal on which to perform the search.

rgExp

Required. An instance of a Regular Expression object containing the regular expression pattern and applicable flags.

Remarks
The search method indicates if a match is present or not. If a match is found, the search method returns an integer value that indicates the offset from the beginning of the string where the match occurred. If no match is found, it returns -1.

Example
The following example illustrates the use of the search method.

function SearchDemo(){
var r, re; //Declare variables.
var s = "The rain in Spain falls mainly in the plain.";
re = /falls/i; //Create regular expression pattern.
r = s.search(re); //Search the string.
return(r); //Return the Boolean result.
}