Javascript如何检查，如果一个项目是在一系列

代码示例

javascript检查，如果在列

var extensions = ["image/jpeg","image/png","image/gif"];          
if(extensions.indexOf("myfiletype") === -1){
	alert("Image must be .png, .jpg or .gif");
}

如何检查，如果一个项目是在一系列在JavaScript使用阵列。包括()

const nums = [ 1, 3, 5, 7];
console.log(nums.includes(3));
// true

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javascript如何检查，如果一个项目是在一系列

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如果我是在阵列

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