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標籤：on() meta ons font ring lang 效果 strong regexp
1、JavaScript原生函數（內建函數）
JavaScript原生函數（內建函數）有：
String() Number() Boolean() Array() Object() Function() RegExp() Date() Error() Symbol()
2、建立內建函數
<!DOCTYPE html><html lang="zh"> <head> <meta charset="UTF-8" /> <title>JavaScript內建函數</title> </head> <body> <script type="text/javascript"> console.log(new Date()); //不使用new關鍵字會自動補上，效果同上 console.log(Date()) console.log(new Array(3)); //不使用new關鍵字會自動補上，效果同上 console.log(Array(3)) </script> </body></html>
注意Symbol不使用new進行建立。
JavaScript原生函數（內建函數）
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