String 又原生的replace方法,但是沒有replaceAll。
String.prototype.replaceAll = function (s1, s2) {
return this.replace(new RegExp(s1, "gm"), s2);
}
String.prototype.replaceAll = function(search, replacement) {
var target = this;
return target.replace(new RegExp(search, 'g'), replacement);
};