As soon as the web page is opened, the numbers 1-6 are required to pop up in sequence, and each time they pop up, the page displays a corresponding title line (that is, from h1-h6). Note that h1-h6 tags should not appear on the page, but should be written by js.
哆啦A梦
哆啦A梦 2018-04-09 19:47:34
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林达斯
<script>
for( var i = 1 ; i <= 6 ; i++ ){
	alert( i ) ;
	document.write( "<h" + i + ">" + "h" + i + "</h" + i + ">"  )
}
</script>

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