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判断指定元素是否在数组中存在 ​

js

获取含有空值数组的长度 ​

js
var arr = ["red", "green", "blue", "pink", "purple", "", , "最后"];
console.log(arr);
console.log(arr.length);
var arr = ["red", "green", "blue", "pink", "purple", "", , "最后"];
console.log(arr);
console.log(arr.length);