JS implements confirmation pop-up window when deleting

JS realizes the confirmation pop-up window when deleting

一种：
<a href="javascript:if(confirm(&#39;确实要删除该内容吗?&#39;))location=&#39;http://www.google.com&#39;">弹出窗口</a>
二种：
<script language="JavaScript">             
function delete_confirm(e) 
{
    if (event.srcElement.outerText == "删除") 
    {
        event.returnValue = confirm("删除是不可恢复的，你确认要删除吗？");
    }
}
document.onclick = delete_confirm;
</script>
<a href="Delete.aspx" onClick="delete_confirm">删除</a>
三种：
if(window.confirm(&#39;你确定要取消交易吗？&#39;)){
                 //alert("确定");
                 return true;
              }else{
                 //alert("取消");
                 return false;
             }

四种：
 <script language="JavaScript">             
function delete_confirm() <!--调用方法-->
{
    event.returnValue = confirm("删除是不可恢复的，你确认要删除吗？");
}
</script>

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