如何让js 将两个数组里的数值一一对应合并

想要这种——
  obj: [
            [4.4, 20],
            [4.4, 60],
        ],
过程——
var stationData =that.cdata.Wind_Speed_2;
          console.log("风俗")//如下图
          console.log(stationData)//如下图
          console.log(that.cdata.Wind_Direction_2)//如下图
 var obj = stationData.map((item,index) => {
              return {...item, ...that.cdata.Wind_Direction_2[index]};
          });
          console.log(obj)//如下图
结果——

      const a = [4.4, 4.4, 5.5, 6.6, 7.7, 8.8];
      const b = [10, 20, 30, 40, 50, 20];
      const allAb = [];
      a.forEach((item, index) => {
        allAb.push([item, b[index]]);
      });
      console.log(allAb);