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Vue array push object problem

2022-02-03 01:31:46 【CSDN Q & A】

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When I come across such a problem , Before the test push Yes, you can add data , Yes, it works , After I don't know why push I've been reporting mistakes all the time , hold push If deleted, no error will be reported , I'd like to ask why ？？ There is no substitute for push Method for adding objects to an array ？



Refer to the answer 1：

Array .push() Do you use console.log( Array ) Print this array , See what it is



Refer to the answer 2：


Refer to the answer 3：

push It's an array method . explain you Called Variable It's not an array [].push() . You can print it and see



Refer to the answer 4：


Refer to the answer 5：

This is because properties by null As a result of ,debugger Take a look , It's OK to write a check bar
Insert object into array push
Data splicing array concat / Deconstruct assignment [...arr]
Object replication Shallow copy Object.assign , Deep copy JSON.stringify + JSON.parse



Refer to the answer 6：


Refer to the answer 7：

Wrong meaning ：

Non array variables call push Wrong method .

terms of settlement ：

Call push Print out the object of the method
It is estimated that this variable has been changed in the middle of the code , It's not an array .



Refer to the answer 8：


Refer to the answer 9：

Your data is not an array , Where should you assign it to become undefined 了
stay push It is necessary to judge whether it is an array
arr instanceof Array && arr.push()



Refer to the answer 10：

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