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var items = [1, 2, ‘a‘, 3, 4, ‘b‘, 5, ‘c‘, 6, 119, ‘d‘]; var randomItem = items[Math.floor(Math.random() * items.length)];
var argArray = Array.prototype.slice.call(arguments);
var arr1 = [1, 2, 3]; var arr2 = [4, 5, 6]; Array.prototype.push.apply(arr1, arr2); console.log(arr1); // [1, 2, 3, 4, 5, 6]
var numbers = [5, 458 , 120 , -215 , 228 , 400 , 122205, -85411]; var maxNumber = Math.max.apply(null, numbers); // 或者 var numbers = [5, 458 , 120 , -215 , 228 , 400 , 122205, -85411]; numbers.sort(function(a, b){return b - a})[0];
var myArray = [1 , 2, 3]; myArray.length = 0;
var myArray = [a, b, c, d, e, f]; myArray.length = 4; console.log(myArray); //[a, b, c, d]
myArray.length = 10; console.log(myArray[myArray.length - 1]) ; // undefined
var array= [1, 2, 3, 4].map(function (ele) { return ele * ele; }); console.log(array); // [1, 4, 9, 16]
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原文地址：http://www.cnblogs.com/happyfreelife/p/4248461.html
