js占位符替换

String.prototype.format = function() { if(arguments.length == 0) return this; var param = arguments[0]; var s = this; if(typeof(param) == 'object') { for(var key in param) s = s.replace(new RegExp("\{" + key + "\}", "g"), param[key]); return s; } else { for(var i = 0; i < arguments.length; i++) s = s.replace(new RegExp("\{" + i + "\}", "g"), arguments[i]); return s; } }