错误:对象不支持属性或方法'setAttribute'

Function:

功能:

function disable_hidden_flip_questions(option, value){
    var first_q = document.getElementById('hidden_auto_questions');
    var second_q = document.getElementById('hidden_include_auto');
    var inputs_list = [];
    if(option == 'all'){
        inputs_list.push(first_q.getElementsByTagName("input"));
        inputs_list.push(second_q.getElementsByTagName("input"));
    }else if (option == 'first'){
        inputs_list.push(first_q.getElementsByTagName("input"));
    }else if(option == 'second'){
        inputs_list.push(second_q.getElementsByTagName("input"));
    }

    for (var inputs in inputs_list){
        for(var input in inputs_list[inputs]){
            if(inputs_list[inputs].hasOwnProperty(input) && input != 'length'){
                if(!value){
                    inputs_list[inputs][input].removeAttribute('disabled');
                }else{
                    inputs_list[inputs][input].setAttribute("disabled", "disabled");
                }
            }
        }
    }
}
function disable_hidden_flip_