returnValue是javascript中html的window對象的屬性,目的是返回視窗值,當用
window.showModalDialog函數開啟一個IE的強制回應視窗(強制回應視窗知道吧,就是開啟後不能操作父視窗,只能等強制回應視窗關閉時才能操作)時,用於返回視窗的值,下面舉個例子:
------------------------------------------------------------------------------
//father.html
<HTML>
<HEAD>
<META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
<TITLE></TITLE>
<script language="javascript">
function showmodal(){
var ret = window.showModalDialog("child.htm",null,"dialogWidth:350px;dialogHeight:350px;help:no;status:no");
if (ret){alert('子視窗返回真!');
}else{
alert('子視窗返回假!');
}
}
</script>
</HEAD>
<BODY>
<INPUT id=button1 type=button value=Button name=button1 onclick="showmodal();">
</BODY>
</HTML>
------------------------------------------------------------------------------
//child.html
<HTML>
<HEAD>
<META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
<TITLE></TITLE>
<script language="javascript">
function trans(tag){
if (tag==0){
window.returnValue=false;
} else{
window.returnValue =true;
}
window.close();
}
</script>
</HEAD>
<BODY>
<INPUT id=button1 type=button value="返回真" name=button1 onclick="trans(1)">
<INPUT id=button2 type=button value="返回假" name=button2 onclick="trans(0)">
</BODY>
</HTML>
-----------------------------------------------------------------------------
這樣一來可以實現從強制回應視窗向父視窗傳遞值的作用,
這個returnValue除了可以是布爾值,整型值等以外還可以是個js數組，用來傳遞大量資料。
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