React js Multiple Select [对象对象]，[对象对象]

问题描述

我正在使用Material UI进行多次选择。这是我的代码。

  <TextField
        classes={{ root: classes.root }}
        select
        name="states"
        id="states"
        fullWidth
        label="states where you want to work" 
        SelectProps={{
          multiple: true,value: states.states,onChange: handleFieldChange
        }}
      >
        {listStates.map(col => (
              <MenuItem selected classes={{ selected: classes.selected }} key={col} value={col}>
                  <Checkbox checked={states.states.indexOf(col) > -1} />
                  <ListItemText primary={col} />
              </MenuItem>
            ))} 
      </TextField>

这是handleFieldChange函数：

  const handleFieldChange = event => {
      event.persist();
      setStates(states => ({
        ...states,[event.target.name]:
          event.target.type === "checkbox"
            ? event.target.checked
            : event.target.value
      }));
    };

这是状态数组：

const listStates = [ "Aguascalientes","Baja California","Baja California Sur","Campeche","CDMX","Coahuila de Zaragoza","Colima","Chiapas","Chihuahua","Durango","Guanajuato","Guerrero","Hidalgo","Jalisco","EDOMEX","Michoacán de Ocampo","Morelos","Nayarit","Nuevo León","Oaxaca","Puebla","Querétaro","Quintana Roo","San Luis Potosí","Sinaloa","Sonora","Tabasco","Tamaulipas","Tlaxcala","Veracruz de Ignacio de la Llave","Yucatán","Zacatecas"];

一切正常，这些值正确保存在useState中，但是在屏幕上我看不到我选择的值，只看到了[object Object]，[object Object]。

你知道为什么会这样吗？

致谢

解决方法

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