JavaScript 总是返回 true，即使事实并非如此
这可能是有史以来最奇怪的 JavaScript 问题：
$('div.GiftContainer').live('click', function () {
var self = $(this);
var price = $(this).attr('data-price');
if (!self.hasClass('selected')) {
if (price <= MyCredits) { // always returns true
alert('OK');
self.addClass('selected').siblings().removeClass('selected');
} else {
alert('MOO!');
}
} else {
self.removeClass('selected');
}
});
即使我在条件之前添加 console.log(price + ' ' + MyCredits); 也会返回 true，并且价格小于 MyCredits。
会是什么...
This is probably the weirdest JavaScript issue ever:
$('div.GiftContainer').live('click', function () {
var self = $(this);
var price = $(this).attr('data-price');
if (!self.hasClass('selected')) {
if (price <= MyCredits) { // always returns true
alert('OK');
self.addClass('selected').siblings().removeClass('selected');
} else {
alert('MOO!');
}
} else {
self.removeClass('selected');
}
});
Returns true even when I added console.log(price + ' ' + MyCredits); right before the condition and price was smaller than MyCredits.
What could it be...
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尝试parseInt()。这应该可以修复它，以确保它们被 JS 正确解释。
Try parseInt(). That should fix it to make sure that they're being properly interpreted by JS.
JavaScript 中有类型。这可能会令人困惑，因为它是一种动态语言。请尝试以下操作以确保两个值都是
数字：if (parseInt(price, 10) <= parseInt(MyCredits, 10))以下是更多信息：http://en.wikibooks.org/wiki/JavaScript/Variables_and_Types
There are types in JavaScript. This can get confusing because it is a dynamic language. Try the following to ensure both values are
numbers:if (parseInt(price, 10) <= parseInt(MyCredits, 10))Here is some more information: http://en.wikibooks.org/wiki/JavaScript/Variables_and_Types
那么在这种情况下
price <= MyCredits为 true。所以没有什么问题。Well in that case
price <= MyCreditsis true. So there's nothing wrong.