如何使用 JavaScript 将 iframe 的宽度更改为 100%？

给定一个包含            

                        Click to change                                        

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        How to change the width of an 
        iframe to 100% with JavaScript? 
     
 
     
 
    
         
            GeeksforGeeks  
         
         
            How to change the width of a 
            to 100% with JavaScript? 
         
         
        
  
         
         
            Click to change 
         
          
         
            // JavaScript code to change the 
            // width to 100% of <iframe> 
            function changewidth() { 
                var x = document.getElementById('iframe'); 
                x.style.width = window.innerWidth; 
            }