javascript - 无法调用未定义的方法 'toLowerCase'

Question

我正在尝试重构我的 js 代码以使其更加干练，但遇到了这个错误。这是我的代码

function validate_field(e){
    console.log(typeof e);
    $(e).focusout(function(e){
        var price = $(e).val();
        var number = parseInt(price, 10);
        console.log(number)
        if (number < 0)
        {
            $(e).val(0);
        }
    })
}
$(function(){
    validate_field('#price');
})

根据 stacktrace 错误在某处 var price = $(e).val();我在这里缺少什么？

Answer 1

尝试

   function validate_field(e){
        console.log(typeof e);
        $(e).focusout(function(ev){
-------------------------------^ here you are redeclaring the e previously passed as selector 
            var price = $(e).val();
            var number = parseInt(price, 10);
            console.log(number)
            if (number < 0)
            {
                $(e).val(0);
            }
        })
    }
    $(function(){
        validate_field('#price');
    })