浏览器兼容问题，Chrome中Flash的onclick事件

群里的朋友问了个问题：

chrome下面如何给flash加onclick事件？

搜索了下，找到了一些方法，但那些方法是说其他浏览器的，用一个button包住flash

在Chrome中 embed不支持onclick，但支持onmouseover，onmousedown，onmouseup

就利用这几个方法，自己拼凑一个click事件：

设置一个变量click
over的时候 +1
down的时候 +2
up 的时候 +4
out的时候 清零
发生up的时候，检查click变量，如果是7，那就是click事件了

<div style="border:1px #f00 solid; width:486px">
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" id="flash_obj" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0" width="468" height="60">
  <param name="movie" value="http://static.googleadsserving.cn/pagead/imgad?id=CICAgICQjvvjThDUAxg8MgiCYoyW5NzeKQ">
  <param name="quality" value="high">
  <param name="AllowScriptAccess" value="never">
  <param name="wmode" value="opaque">
  <param name="FlashVars" value="">
  <embed src="http://static.googleadsserving.cn/pagead/imgad?id=CICAgICQjvvjThDUAxg8MgiCYoyW5NzeKQ" id="flash_embed" width="468" height="60" wmode="opaque" flashvars="" type="application/x-shockwave-flash" allowscriptaccess="never" pluginspage="http://www.macromedia.com/go/getflashplayer" >
</object>
</div>

<script>
if(!console){
  console = { log: function(){} };
}
var timeoutID,
    c = 0,
    flashObj = document.getElementById('flash_obj'),
    flashEmbed = document.getElementById('flash_embed');
function over(){
  c |= 1;
  console.log('mouse over', c);
}
function out(){
  c = 0;
  console.log('mouse out', c);
}
function down(){
  c |= 2;
  console.log('mouse down', c);
}
function up(){
  c |= 4;
  console.log('mouse up', c);
  if(c === 7){
    click();
    c |= 8;
    if(! timeoutID){
      console.log('avoid twice click', c);
      timeoutID = setTimeout(function(){
        c ^= 8; //异或，a ^ b， ab不同则返回1
        console.log('resume click', c);
        timeoutID = undefined;
      },100);
    }
  }
}
function click(){
  console.log('trigger click', c);
  alert('click');
}
if(flashObj){
  flashObj.onmouseover = over;
  flashObj.onmouseout = out;
  flashObj.onmousedown = down;
  flashObj.onmouseup = up;
}
if(flashEmbed){
  flashEmbed.onmouseover = over;
  flashEmbed.onmouseout = out;
  flashEmbed.onmousedown = down;
  flashEmbed.onmouseup = up;
}
</script>

呃，上面的四个事件都会同时发生两次，所以用了更高位（8）来避免重复事件，并在100毫秒后恢复