Detailed explanation of the use of v-for iteration syntax in Vue2.0

This time I will bring you a detailed explanation of the use of v-for iteration syntax in Vue2.0. What are the precautions for using v-for iteration syntax in Vue2.0. The following is a practical case, let’s take a look. take a look.

Today, when writing code about Vue2.0, I found that the value of $key cannot be rendered successfully. The problem is as follows:

The result is this The key value of object cannot be displayed:

#I later found out after consulting the documentation that this is because in Vue2.0, the v-for iteration syntax has already occurred Changed:

Discarded:

##New array Syntax

value in arr 
(value, index) in arr

New object syntax

value in obj (value, key) in obj 
(value, key, index) in obj

After solving:

The use of v-for index index in html

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