新手提问

Question

我的问题是这样子的，如果给一个标签赋于onmouseover事件调用一个函数，能不能在这个函数里写onmouseout呢？换个说法也就是说函数里能不能写事件？如果能写该怎样写？

Answer 1

<div onmouseover='div_over(this)'>.....</div>function div_over(elem)
{
  if(!elem.onmouseout)
  {
    elem.onmouseout = function () 
    {
      ......
    }
  }
}

Answer 2

2楼的好使，可以重复，把if(!elem.onmouseout) 去掉也好使：<div onmouseover='div_over(this)'style="width:200;height:100;background:gray;">..... </div>
<script>
function div_over(elem)
{
     elem.onmouseout = function (){ alert("ok");}  
}
</script>

Answer 3

<div id="div1" style="width:200;height:100;background:gray;">..... </div>
<script>
window.onload = function()
{
   var elem = document.getElementById("div1");
   elem.onmouseout = function (){ alert("ok");} 
}
</script>

Answer 4

    Function DeviceDraw(Ditem,Dtype,DImageUrl,ImageWidth,ImageHeight,DX,DY,isref)
    {
    if (DrawDomainName == currentDomainName  || isref != true)
    {
    if (Ditem != null)
    {
    try{
        if (isref == true)
                {
                    if (!isauto)
                    {
                        if (Ditem._X != "")
                        {
                            DX = Ditem._X;
                        }
                        if (Ditem._Y != "")
                        {
                            DY = Ditem._Y;
                        }
                        if (!isreload)
                        {
                            var exist = SVGDocument.getElementById(Ditem._DevName);
                            if (exist)
                            {
                                DX = exist.getAttribute("x");
                                DY = exist.getAttribute("y");
                                SVGRoot.removeChild(exist);
                            }
                        }
                     } 
                }  
                else
                {
                     if (!isauto)
                    {
                        if (Ditem._X != "")
                        {
                            DX = Ditem._X;
                        }
                        if (Ditem._Y != "")
                        {
                            DY = Ditem._Y;
                        }
                        if (!isreload)
                        {
                            var exist = SVGDocument.getElementById(Ditem._DevName);
                            if (exist)
                            {
                                SVGRoot.removeChild(exist);
                            }
                        }
                   
                    }
                }
        
        var target = SVGDocument.createElementNS("http://www.w3.org/2000/svg","g");
        //target.setAttribute("id",Ditem._AliasName);
        target.setAttribute("id",Ditem._DevName);
        target.setAttribute("name",Ditem._AliasName);
        target.setAttribute("ip",Ditem._ManageIP);
        target.setAttribute("webip",Ditem._WebIP);
        target.setAttribute("username",Ditem._UserName);
        target.setAttribute("password",Ditem._Password);
        target.setAttribute("devname",Ditem._DevName);
        target.setAttribute("urldevname",Ditem._UrlDevName);
        target.setAttribute("devkeyindex",Ditem._DevKeyIndex);
        target.setAttribute("urldevkeyindex",Ditem._UrlDevKeyIndex);
        
        target.setAttribute("x",DX);
        target.setAttribute("y",DY);
        target.setAttribute("cx",DX);
        p.webaddheight(DY);
        target.setAttribute("cy",DY);
        target.setAttribute("type",Dtype);
        target.setAttribute("fill","none");
        target.setAttribute("pointer-events","all");
        target.addEventListener("click",click,false);
        target.addEventListener("mouseover",showDeviceToolitip,false);
        target.addEventListener("mouseout",hiddenTooltip,false);
        
        SVGRoot.appendChild(target);
        
        var targetImage = SVGDocument.createElementNS("http://www.w3.org/2000/svg","image");
        
        targetImage.setAttribute("id",Ditem._AliasName + "image");
        targetImage.setAttribute("height",ImageHeight);
        targetImage.setAttribute("width",ImageWidth);
        targetImage.setAttribute("x",DX);
        targetImage.setAttribute("y",DY);
        targetImage.setAttributeNS("http://www.w3.org/1999/xlink","xlink:href",DImageUrl);
        
        target.appendChild(targetImage);
      
        var text = document.createElementNS("http://www.w3.org/2000/svg","text");
        target.appendChild(text);
        var textnode = document.createTextNode(Ditem._AliasName);
        text.appendChild(textnode);
    
        text.setAttribute("style", "fill:black; font-size:12px; font-weight:bold;");
        var textid = Ditem._AliasName + "text";
        text.setAttribute("id", textid);
    
        var textx = parseFloat(DX) + ImageWidth/2 - text.firstChild.length*6/2;
        text.setAttribute("x", textx);
        var texty = parseFloat(DY) + parseFloat(ImageHeight) + 15;
        text.setAttribute("y", texty);
     }
     finally
     {
         target = null;
         targetImage = null;
         text = null;
         textnode = null;
         exist = null;
     }
        }
    }
    
    }