Javascript String 字符串操作包_javascript技巧-JS Tutorial-php.cn

Home

Web Front-end

JS Tutorial

Javascript String 字符串操作包_javascript技巧

May 16, 2016 pm 06:17 PM

string string

核心代码:

复制代码代码如下:

 
/** 
* jscript.string package 
* This package contains utility functions for working with strings. 
*/ 
if (typeof jscript == 'undefined') { 
jscript = function() { } 
} 
jscript.string = function() { } 
/** 
* This function searches a string for another string and returns a count 
* of how many times the second string appears in the first. 
*（返回字符串中某子串出现的次数） 
* @param inStr The string to be searched. 
* @param inSearchStr The string to search for. 
* @return The number of times inSearchStr appears in inStr, 
* or 0 if inStr or inSearchStr is null or a blank string. 
*/ 
jscript.string.substrCount = function(inStr, inSearchStr) { 
if (inStr == null || inStr == "" || 
inSearchStr == null || inSearchStr == "") { 
return 0; 
} 
var splitChars = inStr.split(inSearchStr); 
return splitChars.length - 1; 
} // End substrCount(). 
/** 
* This function will take take an input string and either strip any 
* character that appears in a given list of characters, or will strip any 
* character that does NOT appear in a given list of characters. 
*（此函数用来屏蔽或者保留 "inCharList" 中的字符，取决于参数 "inStripOrAllow"） 
* @param inStr The string to strip characters. 
* @param inStripOrAllow Either the value "strip" or "allow". 
* @param inCharList This is either (a) the list of characters that 
* will be stripped from inStr (when inStripOrAllow == 
* "strip"), or (b) the list of characters that will 
* NOT be stripped from inStr (when inStripOrAllow == 
"allow". 
* @return The value of inStr after characters have been 
* stripped as specified. 
*/ 
jscript.string.stripChars = function(inStr, inStripOrAllow, inCharList) { 
if (inStr == null || inStr == "" || 
inCharList == null || inCharList == "" || 
inStripOrAllow == null || inStripOrAllow == "") { 
return ""; 
} 
inStripOrAllow = inStripOrAllow.toLowerCase(); 
var outStr = ""; 
var i; 
var j; 
var nextChar; 
var keepChar; 
for (i = 0; i nextChar = inStr.substr(i, 1); 
if (inStripOrAllow == "allow") { 
keepChar = false; 
} else { 
keepChar = true; 
} 
for (j = 0; j checkChar = inCharList.substr(j, 1); 
if (inStripOrAllow == "allow" && nextChar == checkChar) { 
keepChar = true; 
} 
if (inStripOrAllow == "strip" && nextChar == checkChar) { 
keepChar = false; 
} 
} 
if (keepChar == true) { 
outStr = outStr + nextChar; 
} 
} 
return outStr; 
} // End stripChars(). 
/** 
* This function can check is a given string either only contains characters 
* from a list, or does not contain any characters from a given list. 
*（此函数用来判断 inString 是否为 inCharList 中的字符，或者进行相反的判断，取决于参数 inFromExcept） 
* @param inString The string to validate. 
* @param inCharList A list of characters that is either (a) the only 
* characters allowed in inString (when inFromExcept 
* is == "from_list") or (b) the only characters that 
* cannot appear in inString (when inFromExcept is 
* == "not_from_list"). 
* @param inFromExcept When this is "from_list", then inString may only 
* contain characters from inCharList. When this is 
* "not_from_list", then inString can contain any character 
* except thos in inCharList. 
* @return True if inString only contains valid characters, 
* as listed in inCharList when inFromExcept == 
* "from_list", false if not, or true if inString does 
* not containt any of the characters listed in 
* inCharList when inFromExcept == "not_from_list". 
*/ 
jscript.string.strContentValid = function(inString, inCharList, inFromExcept) { 
if (inString == null || inCharList == null || inFromExcept == null || 
inString == "" || inCharList == "") { 
return false; 
} 
inFromExcept = inFromExcept.toLowerCase(); 
var i; 
if (inFromExcept == "from_list") { 
for (i = 0; i if (inCharList.indexOf(inString.charAt(i)) == -1) { 
return false; 
} 
} 
return true; 
} 
if (inFromExcept == "not_from_list") { 
for (i = 0; i if (inCharList.indexOf(inString.charAt(i)) != -1) { 
return false; 
} 
} 
return true; 
} 
} // End strContentValid(). 
/** 
* This function replaces a given substring of a string (all occurances of 
* it to be more precise) with a specified new substring. The substrings 
* can of course be single characters. 
*（此函数进行字符串的替换功能，将 inSrc 中的 inOld 全部替换为 inNew） 
* @param inSrc The string to replace substring(s) in. 
* @param inOld The substring to replace. 
* @param inNew The new substring to insert. 
* @return The value of inSrc with all occurances of inOld replaced 
* with inNew. 
*/ 
jscript.string.replace = function(inSrc, inOld, inNew) { 
if (inSrc == null || inSrc == "" || inOld == null || inOld == "" || 
inNew == null || inNew == "") { 
return ""; 
} 
while (inSrc.indexOf(inOld) > -1) { 
inSrc = inSrc.replace(inOld, inNew); 
} 
return inSrc; 
} // End replace(). 
/** 
* Function to trim whitespace from the beginning of a string. 
*（从字符串的左面开始去除空白字符） 
* @param inStr The string to trim. 
* @return The trimmed string, or null if null or a blank string was 
* passed in. 
*/ 
jscript.string.leftTrim = function(inStr) { 
if (inStr == null || inStr == "") { 
return null; 
} 
var j; 
for (j = 0; inStr.charAt(j) == " "; j++) { } 
return inStr.substring(j, inStr.length); 
} // End leftTrim(). 
/** 
* Function to trim whitespace from the end of a string. 
*（与上面的函数相对应，从字符串的右侧去除空白字符） 
* @param inStr The string to trim. 
* @return The trimmed string, or null if null or a blank string was 
* passed in. 
*/ 
jscript.string.rightTrim = function(inStr) { 
if (inStr == null || inStr == "") { 
return null; 
} 
var j; 
for (j = inStr.length - 1; inStr.charAt(j) == " "; j--) { } 
return inStr.substring(0, j + 1); 
} // End rightTrim(). 
/** 
* Function to trim whitespace from both ends of a string. 
* 
* @param inStr The string to trim. 
* @return The trimmed string, or null if null or a blank string was 
* passed in. 
*/ 
jscript.string.fullTrim = function(inStr) { 
if (inStr == null || inStr == "") { 
return ""; 
} 
inStr = this.leftTrim(inStr); 
inStr = this.rightTrim(inStr); 
return inStr; 
} // End fullTrim(). 

演示区：

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn