Vue: Detailed explanation of memory leaks

What is a memory leak? A memory leak means that a new piece of memory is created but cannot be released or garbage collected. After a new object is created, it applies for a piece of heap memory. When the object pointer is set to null or it leaves the scope and is destroyed, this memory will be automatically garbage collected in JS if no one references it. However, if the object pointer is not set to null and the code cannot obtain the object pointer, the memory it points to cannot be released, which means a memory leak occurs.
 
Memory leak refers to the situation where the dynamically allocated heap memory in the program is not released or cannot be released by the program for some reason, resulting in a waste of system memory, slowing down the program running speed or even causing serious consequences such as system crash.
 
 
 
1. The echarts chart was not completely deleted;
2. setTimeout and setInterval are not cleared;
3. The global variables are not cleared;
4. Listener not cleared

Scenario Analysis

The global object onresize and the listening event should be cleared before the group is destroyed.

insert image description here

Key point: In vue, echarts drawing is very resource-intensive, so the corresponding data must be cleared before the component is destroyed.

The definition in data is as follows:

insert image description here

Before destroying a component, you should do the following:

insert image description here

vue1

vue2

3keep-alive

Once you use keep-alive, you have access to two other lifecycle hooks: activated and deactivated. If you want to clean up or change data when a keep-alive component is removed, you can use the deactivated hook.

deactivated: function () {
  // Remove any data you don't want to keep, or destroy any places where memory leaks may occur}

Summarize

This article ends here. I hope it can be helpful to you. I also hope that you can pay more attention to more content on 123WORDPRESS.COM!

You may also be interested in:

Do you know if eventBus in Vue will cause memory leaks?
Vue optimization: common memory leak problems and optimization details
Solve the memory leak problem caused by Vue custom instructions
Solve the problem of memory surge and computer freezing when vue-cli project is developed and running
Summary of memory leak issues in electron-vue development environment
Summary of memory leak location and repair issues in Vue single-page applications
Solve the problem of Vue memory overflow error

<<: Docker Modify Docker storage location Modify container image size limit operation

>>: MySQL SQL Optimization Tutorial: IN and RANGE Queries