JS占内存不错,但有它的好处
JS被载入内存后,只要不刻意销毁,在其生命周期内会常驻内存
可以加快页面的加载和显示
以以上flash标签改为js调用为例,上述代码改为JS调用后
function flash_view(flashURL,flashHEIGHT,flashWIDTH){
document.writeln ('<OBJECT classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,0,0" WIDTH='+flashWIDTH+' HEIGHT='+flashHEIGHT+'>');
document.writeln ('<PARAM NAME=movie VALUE="'+flashURL+'">');
document.writeln ('<PARAM NAME=wmode VALUE=transparent>');
document.writeln ('<PARAM NAME=loop VALUE=true>');
document.writeln ('<PARAM NAME=quality VALUE=high>');
document.writeln ('<EMBED src="'+flashURL+'" loop=true wmode=opaque quality=high swLiveConnect=FALSE WIDTH='+flashWIDTH+' HEIGHT='+flashHEIGHT+' TYPE="application/x-shockwave-flash" PLUGINSPAGE="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash"></EMBED>');
document.writeln ('</OBJECT>');
}
这部分代码只会在第一次载入它的页面中载入一次,在页面有效期内,不管是相同的flash连接调用它,
还是不同的flash连接调用它,都不需要重新向服务器索取.
但每个flash连接都要向服务器索取下面相同的代码:
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,0,0" width="550" height="400"><param name="allowScriptAccess" value="sameDomain"><param name="movie" value="{1}"><param name="quality" value="high"><param name="bgcolor" value="#ffffff"><embed src="{1}" quality="high" bgcolor="#ffffff" width="550" height="400" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" /></object> |