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JS中实现replaceAll的方法(实例代码)

  

[JS,replaceAll方法]JS中实现replaceAll的方法(实例代码)

  

第一次发现JavaScript中replace() 方法如果直接用str.replace("-","!") 只会替换第一个匹配的字符.

  
而str.replace(/\-/g,"!")则可以全部替换掉匹配的字符(g为全局标志)。

  

  

replace()  
The replace() method returns the string that results when you replace text matching its first argument  
(a regular expression) with the text of the second argument (a string).

  
If the g (global) flag is not set in the regular expression declaration, this method replaces only the first  
occurrence of the pattern. For example,  

  

var s = "Hello. Regexps are fun.";s = s.replace(/\./, "!"); // replace first period with an exclamation pointalert(s);  

  

produces the string “Hello! Regexps are fun.” Including the g flag will cause the interpreter to  
perform a global replace, finding and replacing every matching substring. For example,  

  

var s = "Hello. Regexps are fun.";s = s.replace(/\./g, "!"); // replace all periods with exclamation pointsalert(s);  

  

yields this result: “Hello! Regexps are fun!”  

  

所以可以用以下几种方式.:  
string.replace(/reallyDo/g, replaceWith);  
string.replace(new RegExp(reallyDo, 'g'), replaceWith);  

  

string:字符串表达式包含要替代的子字符串。

  
reallyDo:被搜索的子字符串。

  
replaceWith:用于替换的子字符串。

  
代码如下:

  
  
String.prototype.replaceAll = function(reallyDo, replaceWith, ignoreCase) {  
if (!RegExp.prototype.isPrototypeOf(reallyDo)) {  
return this.replace(new RegExp(reallyDo, (ignoreCase ? "gi": "g")), replaceWith);  
} else {  
return this.replace(reallyDo, replaceWith);  
}  
}  
  
  

(责任编辑:admin)

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