JS bubble sort and select sort

Bubbling

for(let i=0;i<arr.length-1;i++){
     // Control the number of trips 
    for(let j=0;j<arr.length-i-1;j++){
      // Control the number of exchanges 
        if(arr[j]>arr[j+1]){
    
            var temp = arr[j];
            arr[j] = arr[j+1];
            arr[j+1] = temp;
        }
    }
}

choice

for(let i=0;i<arr.length;i++){
     // Control the number of cycles 
    let k = i; // Mark , The subscript of the lowest decimal 
    var min = arr[k]  // Let the first be the smallest number 
    for(let j = i+1;j<arr.length;j++){
     // Find the smallest number in the sequence , use k Mark subscript 
        if(min>arr[j]){
    
            min = arr[j];
            k = j;
        }
    }
    if(k!=i){
     //arr[i] Is the default minimum number  arr[k] Is the actual minimum number 
        var temp = arr[i];
        arr[i] = arr[k]
        arr[k] = temp;
    }
}