javascript中有一些物件看起來用起來像是陣列，但是他們並不是陣列。比如arguments和NodeList物件。為了方便操作，需要將這類資料型別轉換為陣列型別。下面以NodeList為例，介紹幾種陣列轉換方法：

slice.call

var div_list = document.querySelectorAll('div'); // returns NodeList
var div_array = Array.prototype.slice.call(div_list); // converts NodeList to Array

spraead operator

var
 
 div_list = document.querySelectorAll('div'); // returns NodeList
var div_array = [...div_list]; // converts NodeList to Array

Array.from

var div_list = document.querySelectorAll('div'); // returns NodeList
var div_array = Array.from(div_list); // converts NodeList to Array

遍歷

var div_list = document.querySelectorAll('div'
 
); // returns NodeList
Object.keys(div_list).forEach(function(key) {
  console.log(div_list[key]);
})