Why my alert (1) when the browser will pop up twice, please detailed reason code attached-CodePudding

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Why my alert (1) when the browser will pop up twice, please detailed reason code attached

Time：05-16

Why my alert (1) when the browser will pop up twice, please detailed the reason
Code the enclosed

 
 
 
 
<meta charset="utf-8" & gt; 
  
 
<body> 
 
<script> 
Alert (1) 
</script>