Number('0b111');
            Number('0o10');

            Number.isFinite(15);
            Number.isFinite(Infinity);
            Number.isFinite('foo');
            Number.isNaN(10);
            Number.isNaN(NaN);

            //ES5
            (function(global){
                var global_isNaN = global.isNaN;
                Object.defineProperty(Number,'isNaN',{
                    value:function isNaN(value){
                        return typeof value === 'number' && global_isNaN(value);
                    },
                    configurable:true,
                    enumerable:false,
                    writable:true
                });
            })(this);

        Number.parseInt === parseInt;
        Number.parseFloat === parseFloat

        Number.isInteger(3.0)
        Number.isInteger(3.1)
        Number.isInteger('3.1')

        Number.EPSILON.toFixed(20);

        //浮点数运算误差检查函数
        function withinErrorMargin(left,right){
            return Math.abs(left - right) < Number.EPSILON;
        }

        withinErrorMargin(0.1+0.2,0.3)
        withinErrorMargin(0.2+0.2,0.3)

        Number.MAX_SAFE_INTEGER
        Number.MIN_SAFE_INTEGER

        Number.isSafeInteger('a')
        Number.isSafeInteger(10)
        Number.isSafeInteger(9007199254740993)