Executing JavaScript in the <head>, getElementById returns null

前端未结
关注
 3  1212
旧巷少年郎 2021-01-05 00:49
I have following code

      
      
        
          3条回答        

        
                    
            
            
                         
                
              
              
                
                   [愿得一人]
                                             
                
                
                (楼主)
            
              
              
                2021-01-05 01:17
              

            
            
                        
It's null because you're calling the script before the DOM has been loaded.

Wrap your script in a function which will be invoked onload, e.g.:

window.onload = function() {
    var q = new foo();
    q.run('yellow');
};

    
             
                                                        
            
            
              
                
                0
              
                   
                
               讨论(0)
              
                                                  
              
              
                          
             
       
          
              
                                       
     查看其它3个回答


            
                         
                    


               
            
    发布评论:
    
         
                        
    
    提交评论 
  
  

                    
                    
                    
                        
                        
                         加载中...
                        
                    
                
          
                              			
        
        
        
          
            
            
              
              
            
    


                                 
              
            
                          
    

        
         
                验证码
                
                  
                
                
                   看不清?
                
              
                                  
                    
   
                 
             
              提交回复