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。

Js代码

以上这篇js替换字符串中所有指定的字符(实现代码)就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持编程之家。