join() 陣列轉字串
Javascript 中的 Join() 方法，是將陣列中的值，合併成字串，陣列間值與值組合時，連接符號預設以”,”相連，也允許自訂連接符號。
const a = ['js', 'join','test']
console.log(a.join())
// expected output: "js,join,test"
console.log(a.join(', '))
// expected output: "js, join, test"
console.log(a.join(''))
// expected output: "jsjointest"
console.log(a.join('-'))
// expected output: "js-join-test"
console.log(a.join(' '))
// expected output: "js join test"
console.log(a.join('___'))
// expected output: "js___join___test"Join() 相容性
相容性請參照 MDN Join() 瀏覽器相容性
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