如何添加新的键值以反应js状态数组? [英] How to add a new key value to react js state array?
问题描述
我想向数组ınto状态添加新的键值吗?我在下面告诉你我想做什么.我怎样才能做到这一点? 1.以构造方法启动状态
I want to add new key value to array ınto state? I tell you what I want to do below. How can I do that? 1. Start state in consruture method
`this.state = {
files: []
}'
-
使用活动文件设置状态之后
After I doing set state with active files
this.setState({files:activeFiles})
this.setState({files: activeFiles})
显示我的状态
{
files:
[
{
key1: val1,
key2: val2,
key3: val3
},
{
key1: val1,
key2: val2,
key3: val3
},
{
key1: val1,
key2: val2,
key3: val3
}
]
}
{
files:
[
{
key1: val1,
key2: val2,
key3: val3
},
{
key1: val1,
key2: val2,
key3: val3
},
{
key1: val1,
key2: val2,
key3: val3
}
]
}
如何为每个文件添加新的键值? 我想要的状态
How to add new key value for each file? The state I want
{
files:
[
{
key1: val1,
key2: val2,
key3: val3,
key4: val4
},
{
key1: val1,
key2: val2,
key3: val3,
key4: val4
},
{
key1: val1,
key2: val2,
key3: val3,
key4: val4
}
]
}
{
files:
[
{
key1: val1,
key2: val2,
key3: val3,
key4: val4
},
{
key1: val1,
key2: val2,
key3: val3,
key4: val4
},
{
key1: val1,
key2: val2,
key3: val3,
key4: val4
}
]
}
推荐答案
我认为这将满足上述情况.
I think This will meet the above scenario.
const newFile = this.state.files.map((file) => {
return {...file, key4: val4};
});
this.setState({files: newFile });
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