<script language=javascript>
function window.alert(str){
//Here is empty
}
alert("fffffff");
</script>
 I'm going to reload it alert The function definitions function window.alert(str){} Put it in a public one js In the file   He didn't receive the alert The trouble of

 If prompted, define it this way
function window.alert(str){
//Open a mode dialog box here to show STR string closed after a delay of 20ms
}