Question

通过这种简单但非常方便的方法来sample from an array without replacement，我们可以看到类似的

arr = ["a", "b", "c", "d", "e", "f"]
arr.sample(10)
=> ["b", "a", "d", "f", "e", "c"]

如何完成相同的任务，但 可以替换 ？因此，在示例.sample(10)中将返回长度为10的数组，其中包含一些重复的元素吗？

例如

arr = ["a", "b", "c", "d", "e", "f"]
arr.sample(10)
=> ["b", "a", "d", "f", "e", "c", "b", "e", "a", "b"]

Answer 1

采集1个样本10次并收集结果：

 $(document).ready(function(){
        
    var count=0;
    $(document).on('click','#add',function() {
    count++; 
    
    var html= '';
    html += '<tr id="trrows">';
    
    html += '<td id="testid"> <input id="test_id[]" class="form-control" type="text" style="width:200px" onblur="checkname();" onkeyup="checkname();" onchange="checkname();"> </td>';
    html += '<td id="testname"> <input id="test_name"  type="text" style="width:300px" class="form-control "  readonly="" onblur="checkname();" onkeyup="checkname();" onchange="checkname();"> </td>';
    html += '<td id="amounts">  <input id="amount" type="text" style="min-width:150px" class="form-control"  readonly="" > </td>';
    html += '<td><center> <a href="javascript:void(0)" class="text-danger font-18 remove" title="Remove" id="remove"><i class="fa fa-trash-o"></i></a></center> </td>';
    
    html +=  '</tr>';
    
    $('#rows').append(html);
    
    });
    
    $(document).on('click','.remove',function() {
    $(this).closest("#trrows").remove();
    });
    
    
    });
    
// fetch test name from database      
    function checkname()
    {
    
    var test_id = document.getElementById("test_id[]").value;
    
    $.ajax({
        type: 'post',
        url: "adminquery/fetch_test_name.php", // request file the 'check_email.php'
        data: {'test_id': test_id,},
    success: function (data) {
      $("#test_name").val(data);
        }
       });
    
    // fetch amount from database    
    var testid = document.getElementById("test_id[]").value;
    
    $.ajax({
        type: 'post',
        url: "adminquery/fetch_test_name.php", // request file the 'check_email.php'
        data: {'testid': testid, },
    success: function (data) {
    $("#amount").val(data);
    
    }
    });
             
    }

用红宝石替代样品？

1 个答案: