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函数实现字符替换的方法,实例代码

2019年8月6日 - 前端排行

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。

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)。

复制代码 代码如下:

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,

<script type=”text/javascript”>
  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);
}
}
</script>

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

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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!”

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