W3School TIY Editor
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<!DOCTYPE html> <html> <body> <p>将具有一个字符串元素的数组转换为其他类型：</p> <p id="demo" style="font-family:courier"></p> <script> var x = ["twenty"]; document.getElementById("demo").innerHTML = "Number : " + Number(x) + "<br>" + "String : " + String(x) + "<br>" + "Boolean: " + Boolean(x); </script> </body> </html>