localStorage项目与其他localStorage项目冲突

Question

我有一个问题，当添加定价到本地存储到其他字段。如果我将beforeNoonNPSlot的价格设置为2，但将matineeNPSlot的字段保留为空(它应该保留上次分配给它的价格)。然后，在我更新更改之后。beforeNoonPrice应该是$2.00，但matineeNPSlot是$NaN。另外，如果我为beforeNoonNPSlot和matineeNPSlot分别设置了一个价格，那么就不会出现NaN问题。

我希望它是可选的，以设置任何领域的价格，而不一定是所有的领域没有这个问题。如何防止这种情况发生？

function updatePricingFunction() {
    var beforeNoonFieldChange = document.getElementById('beforeNoonNPSlot').value;
    var matineeFieldChange = document.getElementById('matineeNPSlot').value;

    localStorage.setItem('text', beforeNoonFieldChange);
    localStorage.setItem('text1', matineeFieldChange);
 }

function load() {
    var storedValue = localStorage.getItem('text');
    var storedValue1 = localStorage.getItem('text1');

    beforenoonprice = storedValue;
    matineeprice = storedValue1;
    beforeNoonCPSlot.innerHTML = "$" + parseFloat(storedValue).toFixed(2);
    $("#beforeNoonPrice").attr = parseFloat(storedValue).toFixed(2);

    $('#beforeNoonPrice').append("$" + (storedValue * 1).toFixed(2));

    matineeCPSlot.innerHTML = "$" + parseFloat(storedValue1).toFixed(2);
    $("#matineePrice").attr = parseFloat(storedValue1).toFixed(2);

    $('#matineePrice').append("$" + (storedValue1 * 1).toFixed(2));
}



// JavaScript Document
var beforenoonprice = 6.75; // CHANGE THE PRICE OF THE BEFORE NOON TICKET
var matineeprice = 9.00; // CHANGE THE PRICE OF THE MATINEE TICKET
var seniorprice = 9.25; // CHANGE THE PRICE OF THE SENIOR TICKET
var militaryprice = 9.25; // CHANGE THE PRICE OF THE MILITARY TICKET
var studentdayprice = 8.00; // CHANGE THE PRICE OF THE STUDENT DAY TICKET
var seniordayprice = 6.75; // CHANGE THE PRICE OF THE SENIOR DAY TICKET
 var adultprice = 10.75; // CHANGE THE PRICE OF THE ADULT TICKET
var childprice = 8.00; // CHANGE THE PRICE OF THE CHILD TICKET
var threeDprice = 3.50; // CHANGE THE PRICE OF THE REGULAR 3D PRICE
var imaxPrice = 4.50; // CHANGE THE PRICE OF THE IMAX TICKET
var imax3dPrice = 5.50; // CHANGE THE PRICE OF THE IMAX 3D TICKET
var output = document.getElementById('output');

Answer 1

你得到NaN是因为你试图解析一个空字符串，所以你要么在你的代码中添加一个特殊的例子，在格式化之前检查字符串是否为空(默认值为not set或其他值)，要么你将0设为默认值，这样它就可以被解析回来，你就会得到$0，这有意义吗？