改变控件的大小就好了  这个是让全屏的

var docElm = document.documentElement;
var explorer = window.navigator.userAgent.toLowerCase();
if(explorer.indexOf('chrome')>0){//webkit
     if (document.body.scrollHeight === window.screen.height && document.body.scrollWidth === window.screen.width) {
     if (document.exitFullscreen) { 
      document.exitFullscreen(); 
    } 
    else if (document.msExitFullscreen) { 
      document.msExitFullscreen(); 
    } 
    else if (document.mozCancelFullScreen) { 
      document.mozCancelFullScreen(); 
    } 
    else if (document.webkitCancelFullScreen) { 
      document.webkitCancelFullScreen(); 
    } 
  
         } else {
             //W3C
                if(docElm.requestFullscreen){
                        docElm.requestFullscreen();
                }
                //FireFox
                else if(docElm.mozRequestFullScreen){
                        docElm.mozRequestFullScreen();
                }
                //Chrome等
                else if(docElm.webkitRequestFullScreen){
                        docElm.webkitRequestFullScreen();
                }
                //IE11
                else if(elem.msRequestFullscreen){
                        elem.msRequestFullscreen();
                }
         }
}else{//IE 9+  fireFox
if (window.outerHeight === window.screen.height && window.outerWidth === window.screen.width) {
     if (document.exitFullscreen) { 
      document.exitFullscreen(); 
    } 
    else if (document.msExitFullscreen) { 
      document.msExitFullscreen(); 
    } 
    else if (document.mozCancelFullScreen) { 
      document.mozCancelFullScreen(); 
    } 
    else if (document.webkitCancelFullScreen) { 
      document.webkitCancelFullScreen(); 
    } 
         } else {
                    //W3C
                if(docElm.requestFullscreen){
                        docElm.requestFullscreen();
                }
                //FireFox
                else if(docElm.mozRequestFullScreen){
                        docElm.mozRequestFullScreen();
                }
                //Chrome等
                else if(docElm.webkitRequestFullScreen){
                        docElm.webkitRequestFullScreen();
                }
                //IE11
                else if(elem.msRequestFullscreen){
                        elem.msRequestFullscreen();
                }
         }
}

  你加到

这里

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