Tips on using array arrays in javascript_Basic knowledge

Copy code The code is as follows:

var array = new Array(["no1","no2"] );
array["po"] = "props1";
alert(array[0][0]);
alert(array.length); //2
//For arrays Generally speaking, array[0] has the same effect as array["0"] (? Not sure, this is true during testing)
alert(array[0] "_" array["1"] "_" array. po);//