我加了双反斜杠的点，使它工作。欢呼。

var st = "okay.this.is.a.string";
var Re = new RegExp("\\.","g");
st = st.replace(Re," ");
alert(st);

示例:我想将所有双引号(")替换为单引号(')，然后代码将如下所示

var str= "\"Hello\""
var regex = new RegExp('"', 'g');
str = str.replace(regex, '\'');
console.log(str); // 'Hello'

String.prototype.replaceAll = function(character,replaceChar){
    var word = this.valueOf();

    while(word.indexOf(character) != -1)
        word = word.replace(character,replaceChar);

    return word;
}

你需要逃离。因为它在正则表达式中具有“任意字符”的含义。

mystring = mystring.replace(/\./g,' ')

String.prototype.replaceAll = function (needle, replacement) {
    return this.replace(new RegExp(needle, 'g'), replacement);
};

mystring.replace(new RegExp('.', "g"), ' ');