JS DataTables ColReorder API重新排列Bug？

Question

当使用API​​重新排列列时，JS DataTables ColReorder会导致意外的行为。 https://github.com/DataTables/ColReorder/

第一次重新排序工作正常，例如， tableColReorder.fnOrder（[2，1，0]）;

但是，这个后续的重新排序应该返回列的原始顺序，但它不。为什么不？ tableColReorder.fnOrder（[0，1，2]）;

简单拨弄例如这里： http://jsfiddle.net/h7wdt72k/

$(document).ready(function() { 

    // Initialize data table extension. 
    var table = $('table') 
     .DataTable({ 
     paging: false, 
     searching: false, 
     ordering: false, 
     bInfo: false 
    }); 

    // Initialize column re-order extension. 
    tableColReorder = new $.fn.dataTable.ColReorder(table); 

    // Re-order columns. Switch first/last columns. 
    tableColReorder.fnOrder([2, 1, 0]); 

    // Re-order columns to original order 0, 1, 2. Does not work!? 
    tableColReorder.fnOrder([0, 1, 2]); 
    // Get current column order. Did not apply re-order directly above. Why not!? 
    alert(tableColReorder.fnOrder()); 

    // This statement returns columns to original order 1, 2, 3. Works but why!? 
    //tableColReorder.fnOrder([2, 1, 0]); 
}); 

HTML：

<table border="1"> 
    <thead> 
    <tr> 
     <td>1</td> 
     <td>2</td> 
     <td>3</td> 
    </tr> 
    </thead> 
    <tbody> 
    <tr> 
     <td>1</td> 
     <td>2</td> 
     <td>3</td> 
    </tr> 
    <tr> 
     <td>1</td> 
     <td>2</td> 
     <td>3</td> 
    </tr> 
    </tbody> 
</table> 

Answer 1

行为是由设计，而不是一个错误。

//To switch position of two columns, always reorder based on array of consecutive integers (array length = number of columns). 
//Even if columns already moved. Start with array of consecutive integers. 
newColOrder = [0,1,2]; 

// Set new order of columns. 
newColOrder[colTo] = colFrom; // colFrom = index to move column from. 
newColOrder[colFrom] = colTo; // colTo = index to move column to. 
e.g. to switch first and last column. 
newColOrder[0] = 2; 
newColOrder[2] = 0; 
// [2,1,0]; 

// Reorder columns. Switch position of first and last column. 
tableColReorder.fnOrder(newColOrder); 

// Switch position of first and last column again. Returns columns to original position. 
tableColReorder.fnOrder(newColOrder);