<script language="javascript">
var number = new Array(); //数组
var str = '123'; //字符串
if(number != null){
alert('number is not null');
}
if(str != null && str != ''){
alert('str is not null');
}
</script>
var number = new Array(); //数组
var str = '123'; //字符串
if(number != null){
alert('number is not null');
}
if(str != null && str != ''){
alert('str is not null');
}
</script>
return (str=="" || str==null)?true:false;
}var a=null;
alert(isEmpty(a));
a="";
alert(isEmpty(a));
a=" ";
alert(isEmpty(a));
a="null";
alert(isEmpty(a));
a="abcde";
alert(isEmpty(a));