JS immediately breaks the array implementation code _ javascript tips-js tutorial

When using javascript, values are occasionally used, and the values are disrupted. This article introduces a method to efficiently disrupt arrays, for more information, see this method.

The Code is as follows:

Var arr = [];
For (var I = 0; I <100; I ++ ){
Arr [I] = I;
}
Arr. sort (function () {return 0.5-Math. random ()})
Var str = arr. join ();
Alert (str );

Code explanation:
Var arr = []; // create an array. This is recommended. // Var arr = new Array () is not recommended ();
This sentence does not need to be explained.
For (var I = 0; I <100; I ++) {arr [I] = I;} // cyclically assign values to the array
The key is coming.

The Code is as follows:

Code
Arr. sort (function () {return 0.5-Math. random ()})
// Sort sorts arrays.
// It works like this. Select two numbers from the array each time for calculation.
// If the input parameter is 0, the two locations remain unchanged.
// If the parameter is smaller than 0, the switch location
// If the parameter is greater than 0, the position is not exchanged.
// Compare it with the next one using the big number just now. In this way, sort by loop.
/* Exactly. We have used this operation to use 0.5-Math. random. The result is either greater than 0 or less than 0. In this way, the location is either exchanged or not exchanged. Of course, a value greater than or less than 0 is immediately displayed. So the array is sorted immediately. */

The following two sentences are output to you. Haha.