javascript - Can the raact setState() method only modify some properties of an object?

Question

this.state.style:{
width:
height:
color
}
//修改属性
this.setState({style:{}})

Now I want to add an attribute to it through setState. Can I only add one attribute and keep the other attributes with their original values?

Answer 1

When using Object.assign(), be careful not to return the original object, but a new object:

this.setState(Object.assign({}, this.state.style, {width: 666}))