javascript - 将 Jquery 转换为 Javascript 尝试失败

Question

我在将这段 Jquery 代码转换为纯 JavaScript 时遇到困难。

var model = sessionStorage.getItem('themodel');
$('#select0').change(function () {
     var modelValue = $(this).val();
     sessionStorage.setItem('themodel', modelValue );
})
.val(model)

这是我的尝试

var model = sessionStorage.getItem('themodel');
document.getElementById('select0').options.change(function () {
     var modelValue = this.value;
     sessionStorage.setItem('themodel', modelValue );
})
document.getElementById('select0').options.value = model;

Answer 1

您需要在select而不是options上监听并设置值

var model = sessionStorage.getItem('themodel');
document.getElementById('select0').change(function () {
     var modelValue = this.value;
     sessionStorage.setItem('themodel', modelValue );
})
document.getElementById('select0').value = model;