Dynamic generation of N rows and N columns of table tables using one-dimensional arrays

One-dimensional array dynamically generates N rows and N columns of table tables. Someone asked me a question just now. The question is roughly as follows:

Now we need to generate a table with seven columns. All the table content is stored in a JavaScript one-dimensional array in sequence. How can this problem be achieved?

I tried to write the following code. One is to be used as a souvenir, and the other is to use the code in the future.

The specific code and corresponding comments are as follows:

Var arr = []; var col = 7; // The table for generating 7 columns (var I = 0; I <25; I ++) {arr [I] = I;} // here is an example. In practice, we should specify the specific data var lines = Math. ceil (arr. length/col); // a key step. Here, var str ="

 

 
 
    "; // Header for (var j = 0; j