type: 'Numeric',所以, "speed1" 的值要是数字
data : [{
                                    "speed1" : 71,
                                    "num" : "10"
                            }, {
                                    "speed1" : 63,
                                    "num" : "11"
                            }, {
                                    "speed1" : 77,
                                    "num" : "12"
                            }, {
                                    "speed1" : 85,
                                    "num" : "13"
                            }, {
                                    "speed1" : 79,
                                    "num" : "14"
                            }
                    ]