var oBt=document.getElementById('bt1');
                    
    var ev=document.createEventObject();    //创建一个event对象
    
    //给event对象设置相应的信息
    ev.scrollX=82;
    ev.scrollY=153;
    ev.clientX=77;
    ev.clientY=38;
    ev.ctrlKey=false;
    ev.altKey=false;
    ev.shiftKey=false;
    ev.button=0;
    
    oBt.fireEvent('onclick',ev);

<input id="bt1" type="button" value="确定"/>
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