How to import css and js files into yii2

There are many ways to introduce it:

1. You can introduce it directly on the view page

<?php use yii\helpers\Html;?><?=Html::cssFile(&#39;@web/css/index.css&#39;)?><?=Html::jsFile(&#39;@web/js/jquery.min.js&#39;)?>

2 , you can directly write native code to import, the path is the project directory /web/css or /js

<script src="js/nav.js"></script>

3, you can use assetBundle to manage css styles and js scripts

Resource package definition: basic/assets/AppAsset.php

<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */
 namespace app\assets; 
use yii\web\AssetBundle; 
/**
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
 class AppAsset extends AssetBundle{
     public $basePath = &#39;@webroot&#39;;    
     public $baseUrl = &#39;@web&#39;;    
     public $css = [        
     &#39;css/site.css&#39;,        
     &#39;css/base.css&#39;
    ];    
    public $js = [        
    &#39;js/sliders.js&#39;
    ];    
    public $depends = [ //依赖包，没有可以不写
        &#39;yii\web\YiiAsset&#39;,        
        &#39;yii\bootstrap\BootstrapAsset&#39;,  
    ]; 
    //定义按需加载JS方法，注意加载顺序在最后  
    public static function addScript($view, $jsfile) {  
        $view->registerJsFile($jsfile, [AppAsset::className(), &#39;depends&#39; => &#39;api\assets\AppAsset&#39;]);  
    }  
      
   //定义按需加载css方法，注意加载顺序在最后  
    public static function addCss($view, $cssfile) {  
        $view->registerCssFile($cssfile, [AppAsset::className(), &#39;depends&#39; => &#39;api\assets\AppAsset&#39;]);  
    }  
}

Write at the beginning of the view file:

<?php
use yii\helpers\Html;use app\assets\AppAsset;
AppAsset::register($this); 
?>

Up to now, we can test on the browser and find that it is not introduced css and js files, we need to pay attention here, we still need the last step:

We need to add some code to the view file (note: if we use the public view file, we can add it to the public view file, if not Use, can be placed in a separate page)

<?php$this->beginPage() ?> 
<?php $this->head() ?>
<?php $this->beginBody() ?> 
<?php $this->endBody() ?>
<?php $this->endPage() ?>

4. There is no need to define the method in the resource package manager, just introduce it directly in the view page

AppAsset::register($this);  
//css定义一样  
$this->registerCssFile('@web/css/font-awesome.min.css',['depends'=>['api\assets\AppAsset']]);  
  
 $this->registerJsFile('@web/js/jquery-ui.custom.min.js',['depends'=>['api\assets\AppAsset']]);  
//$this->registerJsFile('@web/js/jquery-ui.custom.min.js',['depends'=>['api\assets\AppAsset'],
'position'=>$this::POS_HEAD]);

Recommended related article tutorials: yii tutorial

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