Javascript two-dimensional array definition and initialization Methods

This article mainly summarizes three methods for defining and initializing two-dimensional arrays of js. If you need them, you can refer to them and hope to help you. Method 1: define and initialize them directly, you can use
Var _ TheArray = [["0-1", "0-2"], ["1-1", "1-2"], ["2-1 ", "2-2"]

Method 2: Two-dimensional array with unknown length

Var tArray = new Array (); // declare a dimension first for (var k = 0; k
 
  

  
Input the required value to the defined array.
TArray [6] [1] = 5; // You can pass the value of 5 to the array to overwrite the initialization null.
  
Method 3: before that, the above two methods have problems. method 2, each definition is initialized. Although it can be modified dynamically later, it is still not feasible.
  
So I tried a method to dynamically pass values to the array.
  
Ps: array interesting phenomena encountered in practice
  
We thought that two-dimensional arrays could directly pass in values like the following.
  

  
For (var a = 0;
   
    

    
The result is that the value of the next array is received in tArray [a], and the content of matArray [a] is ignored. If you change the position, matArray [a] is behind, the value of addArray [a] is passed in.
    
Thinking: simple example:

    
 The Code is as follows:
    

Var a = [1, 2];
    
Var B = [];
    
B [0] = a; // pass array a as an element of array B to array B
    
Alert (B [0] [1]); // 2

    
The above is the simplest two-dimensional array,
    

    
The above example is written in another way:

    
 The Code is as follows:
    

Var B = [];
    
B [0] = [1, 2]; // pass the array [1, 2] into array B as an element of array B
    
Alert (B [0] [1]); // 2

    
We can see that the above B [0] = [1, 2] is usable.
    

    
 The Code is as follows:
    

For (var a = 0;
     
    
TArray [a] = [matArray [a], addArray [a]; Modify () in the preceding example to [] to form a two-dimensional array.
    
};

    
Conclusion: method 3:
    

    
 The Code is as follows:
    

For (var a = 0;
     
    
TArray [a] = [aArray [a], bArray [a], cArray [a]; you can also add dArray [a], eArray [a]
    
};

    
This situation applies to the situation where several arrays are known and combined into a two-dimensional array.
    

    

    
Create multi-dimensional arrays in JS
    

    
 《script》  var allarray=new Array();  var res="";  function loaddata()  {   for(var i=0;i<3;i++) { var starth=i*200; var strarw=i*200; var endh=(i+1)*200; var endw=(i+1)*200; allarray[i]=new Array(); allarray[i][0]=new Array(); allarray[i][1]=new Array(); allarray[i][0][0]=starth; allarray[i][0][1]=strarw;  allarray[i][1][0]=endh; allarray[i][1][1]=endw; }  for(var i=0;i";  }  document.getElementById("dv").innerHTML=res;  }《script》