javascript - vue data updated. But the dom is not updated,,,,, as shown in the figure

Question

The operation is to click on the size, the data is updated, but the dom is not updated.

Answer 1

用this.$set(this, 'old', new)

Answer 2

Use this.$nextTick() to update dom

Answer 3

vue has an api called nextTick. Take a look

Answer 4

You can also use splice to modify the array: arr.splice(index, 1, newValue);