//"{0}-{1}-{2}".format("xx","yy","zz")

//显示xx-yy-zz

String.prototype.format = function() {

    var result=this;

    if (arguments.length == 0)

        return null;

    for ( var i = 0; i < arguments.length; i++) {

        var re = new RegExp('\\{' + (i) + '\\}', 'gm');

        result = result.replace(re, arguments[i]);

    }

    return result;

};