JS扩展String.prototype.format字符串拼接的功能

String.prototype.format = function(){  if(arguments.length==0){    return this;  }  for(var s=this, i=0; i<arguments.length; i++){    s = s.replace(new RegExp("//{"+i+"//}","g"), arguments[i]);  }  return s;};

//方式1var test = '我的{0}是{1}';var result = test.format('id','城市之光');//方式2var test = '我的{name1}是{name2}';var result = test.format({name1:'id',name2:'城市之光'});

String.prototype.trim = function() {  return this.replace(/(^/s*)|(/s*$)/g, ""); };String.prototype.ltrim = function() {  return this.replace(/(^/s*)/g, ""); };String.prototype.rtrim = function() {  return this.replace(/(/s*$)/g, ""); };//调用方式var eg1 = $('#id').val().trim();