📄 5.8.html
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<html>
<title>delete运算符的用法</title>
<head>
<script>
var num={x:0,y:1};
document.write(delete num.x,"<br>");
document.write(typeof num.x,"<br>");
document.write(delete num.x,"<br>");
document.write(delete num,"<br>");
x=0;
document.write(delete x,"<br>");
</script>
</head>
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