changed the original object
obj1 = {a:1,b:{b1:1}}
obj2 = Object.assign({},obj1)
obj2.b.b1=2
console.log(obj1.b.b1)// 2obj1 = {a:1,b:{b1:1}}
obj2 = Object.assign({},obj1,{})
obj2.b.b1=2
console.log(obj1.b.b1)// 2the original object has not been changed
obj1 = {a:1,b:{b1:1}}
obj2 = {a:2,b:{b1:2}}
obj3 = Object.assign({},obj1,obj2)
obj3.b.b1=8
console.log(obj1.b.b1)// 1 if the attribute in the target object has the same key, the attribute will be overwritten by the attribute in the source. The properties of later sources will similarly override the previous properties.
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