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@import url(style.css);
/*Ö»ÄÜÓÃÔÚCSSÎļþÖлòÕßstyle±êÇ©ÖÐ*/
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document.createStyleSheet(cssFile);
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var head = document.getElementsByTagName('HEAD').item(0);
var style = document.createElement('link');
style.href = 'style.css';
style.rel = 'stylesheet';
style.type = 'text/css';
head.appendChild(style);
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function loadJs(file){
    var scriptTag = document.getElementById('loadScript');
    var head = document.getElementsByTagName('head').item(0);
    if(scriptTag) head.removeChild(scriptTag);
    script = document.createElement('script');
    script.src = "../js/mi_"+file+".js";
    script.type = 'text/javascript';
    script.id = 'loadScript';
    head.appendChild(script);
}
function loadCss(file){
    var cssTag = document.getElementById('loadCss');
    var head = document.getElementsByTagName('head').item(0);
    if(cssTag) head.removeChild(cssTag);
    css = document.createElement('link');
    css.href = "../css/mi_"+file+".css";
    css.rel = 'stylesheet';
    css.type = 'text/css';
    css.id = 'loadCss';
    head.appendChild(css);
}
 
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
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    { 
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<script type="text/javascript">
window.onbeforeunload=function()
{
alert("onbeforeunload event...");
//return false;
}
</script>
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