JavaScript--defining a two-dimensional array

Method one: Directly defined and initialized, this encounter a small number of cases can be used
var _thearray = [["0-1", "0-2"],["1-1", "1-2"],["2-1", "2-2"]]

Method Two: Two-dimensional array of unknown length

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var tArray = new Array();  //先声明一维for(var k=0;k<i;k++){    //一维长度为i,i为变量，可以根据实际情况改变 tArray[k]=new Array();  //声明二维，每一个一维数组里面的一个元素都是一个数组；for(var j=0;j<p;j++){   //一维数组里面每个元素数组可以包含的数量p，p也是一个变量；tArray[k][j]="";    //这里将变量初始化，我这边统一初始化为空，后面在用所需的值覆盖里面的值 }}

Passing the desired value to the defined array
tarray[6][1]=5;//This allows the value of 5 to be passed into the array, overwriting the initialized null

Method Three: Before this, both methods have problems, method two, each definition is initialized, although the latter can be modified dynamically, but still no method

So I tried a way to dynamically pass in a value to an array

PS: Some interesting phenomena encountered during the practice of the array

Would have thought that a two-dimensional array could pass directly to the value as follows

1234	for(vara=0;a<i;a++){tArray[a]=(matArray[a],addArray[a]); //matArray[a]和addArray[a]是两个数组，这两个数组直接传入tArray[a]中};

The result is that Tarray[a] receives the value of the subsequent array, the contents of Matarray[a] are ignored, and if a position is changed, Matarray[a] is followed, the value of Addarray[a] is passed in.

Thinking: A simple example:

The code is as follows:
var a=[1,2];

var b=[];

b[0]=a;//passing array A as an element of B array into the B array

Alert (b[0][1]); 2

Above is the simplest two-dimensional array,

The above example changes the way:

The code is as follows:

var b=[];

b[0]=[1,2];//the array as an element of the B array into the B array

Alert (b[0][1]); 2

You can see that the above b[0]=[1,2] is available.

The code is as follows:

for (Var a=0;a<i;a++) {

tarray[a]=[Matarray[a],addarray[a]]; The above example () is modified to [] to make a two-dimensional array successfully.

};

Summary: Method Three:

The code is as follows:

for (Var a=0;a<i;a++) {

tarray[a]=[Aarray[a],barray[a],carray[a]]; You can also add darray[a],earray[a]

};

This applies to a number of known arrays, combining them into a two-dimensional array case

JS Creating multidimensional arrays

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<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<allarray.length;i++)  {    var sh=allarray[i][0][0];    var sw=allarray[i][0][1]     var eh=allarray[i][1][0];    var ew=allarray[i][1][1]    res+="第"+i+"个坐标的开始坐标是："+sh+","+sw+"结束坐标是："+eh+","+ew+"<br/>";  }  document.getElementById("dv").innerHTML=res;  }</script>

JavaScript--defining a two-dimensional array