JavaScript pop()函数弹出数组最后数据
// 举例
var ourArray = [1,2,3];
var removedFromOurArray = ourArray.pop();
// removedFromOurArray now equals 3, and ourArray now equals [1,2]
// Setup
var myArray = [["John", 23], ["cat", 2]];
// Only change code below this line.
var removedFromMyArray=myArray.pop();