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window.onload = function(){
document.getElementById("btn").onclick = btn_onclick;
};
function btn_onclick(){
....
}
<script type="text/javascript">
var isOK = false;
window.onload = function(){
isOK = true;
};
function test(){
if(isOK){
btn_onclick();
}
}
</script>
<input type="button" value="test" onclick="test()" />
<script>
createMask();
function createMask()
{
document.write("<div id='shield' style='Z-INDEX:1000;filter:alpha(opacity=10);BACKGROUND-COLOR:#cccccc;LEFT:0;WIDTH:100%;POSITION:absolute;TOP:0;HEIGHT:100%'><br> <img src='images/loading.gif'>数据正在读入中,请稍等...</div>");
}
if(document.addEventListener)//FF
{
document.addEventListener("DOMContentLoaded",hiddenLay,null);
}else
{
document.onreadystatechange=function()
{
hiddenLay(1);
}
}
function hiddenLay()
{
if(arguments[0]!=1||document.readyState=="complete")
{
document.getElementById("shield").style.display="none";
}
}
</script>