您可以使用RegExp javascript对象替换任何字符串/字符的所有出现。

这是代码，

var mystring = 'okay.this.is.a.string';

var patt = new RegExp("\\.");

while(patt.test(mystring)){

  mystring  = mystring .replace(".","");

}

这更简洁/可读，应该比Fagner Brack发布的更好(toLowerCase不是在循环中执行的):

String.prototype.replaceAll = function(search, replace, ignoreCase) {
  if (ignoreCase) {
    var result = [];
    var _string = this.toLowerCase();
    var _search = search.toLowerCase();
    var start = 0, match, length = _search.length;
    while ((match = _string.indexOf(_search, start)) >= 0) {
      result.push(this.slice(start, match));
      start = match + length;
    }
    result.push(this.slice(start));
  } else {
    result = this.split(search);
  }
  return result.join(replace);
}

用法:

alert('Bananas And Bran'.replaceAll('An', '(an)'));

还有一个很容易理解的解决方案:)

var newstring = mystring.split('.').join(' ');

var mystring = 'okay.this.is.a.string';
var myNewString = escapeHtml(mystring);

function escapeHtml(text) {
if('' !== text) {
    return text.replace(/&/g, "&")
               .replace(/&lt;/g, "<")
               .replace(/&gt;/g, ">")
               .replace(/\./g,' ')
               .replace(/&quot;/g, '"')
               .replace(/&#39/g, "'");
} 

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);

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