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如何判断数组

1.Array.isArray

js
console.log(Array.isArray([])) // true

2.instanceof

js
console.log([] instanceof Array)

3.constructor

js
function isArray(arr) {
    if (!(arr instanceof Object)) {
        return false
    }
    return arr.constructor === Array
}
console.log(isArray([]))

4.Object.prototype.toString

js
function isArray(arr) {
    return Object.prototype.toString.call(arr) === '[object Array]'
}
console.log(isArray([]))

5.正则+JSON.stringify

js
function isArray(arr) {
    try {
        return /^\[.*\]$/.test(JSON.stringify(arr))
    } catch (err) {
        return false
    }
}
console.log(isArray([]))