How to close the javascript warning box

Implementation ideas:

Rewrite the "alert" method. The rewritten syntax is: "old method = function (parameter) {content of the new method}" , the return value should be "false", which means no operation is performed.

Specific code:

<script LANGUAGE="JavaScript">
<!--
window.alert = function(str){
return ;
}
alert("不能弹出警示框");//-->
</script>

Recommended tutorial: js entry tutorial

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