var data=[

{

    code: "10004",

    grade: "5.6",

    planQuantity: 220,

},

{

    code: "10024",

    grade: "5.6",

    planQuantity: 200,

},

{

    code: "10034",

    grade: "6.6",

    planQuantity: 210,

}

];

function orderSort(obj1,obj2){

    var a=obj1.planQuantity;

    var b=obj2.planQuantity;

    if(a>b){

        return -1

    }else if(a<b){

        return 1

    }else{

        return 0

    }

};

data.sort(orderSort);

结果如下：