我有一个jQuery的功能，它不能正常工作

Question

function hideShowTextBox(tabName, index, tabContainer) { 
    var tabIndex = index + 1; 
    var dropDownId = tabContainer + '_' + tabName + '_IncomeDetails' + tabIndex + '_dpEmploymentStatus'; 

    //this line gives a blank value..What may be the problem??? 
    alert($(dropDownId + ' option:selected').text()); 
} 

Answer 1

ID选择器必须以#字符开始，例如， #foo。试试：

var dropDownId = '#' + tabContainer + '_' + tabName + '_IncomeDetails' + tabIndex + '_dpEmploymentStatus';