来自 计算机教程 2019-06-07 22:13 的文章
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javascript中使用replaceAll()函数实现字符替换的方法

复制代码 代码如下:

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。

<script language="javascript" type="text/javascript">
function fun(){
document.write(/a/gi.test("a"));
}
fun()
fun()
</script>

复制代码 代码如下:

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