您应该查看Javascript中的map函数：

let a = [["a","c"],["b","d"]]
a.map(x => x[1])

输出：

Array [ "c", "d" ]

您可以循环遍历数组，然后循环遍历其后的每个数组

for (var i = 0; i < arr.length; i++) {  }
     for (var j = 0; j < arr[i].length; j++)
          console.log(arr[i][j]);

代码：-

var myStringArray = [['A', 'PARIKH', "None", "None"], 
           ['B', 'MANISH ', "None", "None"], 
           ['C', 'SHIV ', "None", "None"], 
           ['D', ' GAUR', "None", "None"]] 
// Accessing by list by list
for (var i = 0; i < myStringArray.length; i++) {
    console.log(myStringArray[i]);  
}

// Accessing by element by element in the list
for (var i = 0; i < myStringArray.length; i++) {
    for (var j=0; j<myStringArray[i].length; j++){
    console.log(myStringArray[i][j]);
    }
}

输出：-

[ 'A', 'PARIKH', 'None', 'None' ]
[ 'B', 'MANISH ', 'None', 'None' ]
[ 'C', 'SHIV ', 'None', 'None' ]
[ 'D', ' GAUR', 'None', 'None' ]
A
PARIKH
None
None
B
MANISH 
None
None
C
SHIV 
None
None
D
GAUR
None
None