Array Literal Syntax
To avoid potential errors when creating dynamic arrays at runtime, it's much safer to stick with the array literal notation.
Array Constructor Curiousness
When you pass a single number to the Array() constructor, it doesn't become the value of the first array element.
// an array of one element var a = [3]; console.log(a.length); // 1 console.log(a[0]); // 3 // an array of three elements var a = new Array(3); console.log(a.length); // 3 console.log(typeof a[0]); // "undefined" // using array literal var a = [3.14]; console.log(a[0]); // 3.14 var a = new Array(3.14); // RangeError: invalid array length console.log(typeof a); // "undefined"Clever uses of the Array() constructor
var white = new Array(256).join(' ');
Check for Array-ness
Array.isArray([]); // true // trying to fool the check with an array-like object Array.isArray({ length: 1, "0": 1, slice: function () {} }); // false if (typeof Array.isArray === "undefined") { Array.isArray = function (arg) { return Object.prototype.toString.call(arg) === "[object Array]"; }; }转载于:https://www.cnblogs.com/haokaibo/p/Array-Literal.html
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