如何解决在 Vanilla JS 中计算产品的折扣百分比
嗨,我正在尝试使用 Vanilla JS 计算销售产品的折扣百分比。因此,如果存在销售价格“.product-price__discount”,那么我想计算出该产品的折扣百分比。
到目前为止,我能够计算出第一个产品的折扣。在第二个产品上,它似乎打印了与第一个和最后一个产品没有打折的折扣相同的折扣,因此忽略这一点是正确的。我也知道 .length 有错误,但不知道如何解决。
var pattern = /[^0-9\.]/g;
var price = document.querySelectorAll('.product-slab__price');
price.forEach(function(el){
if(!el.querySelector('.product-price__discount').length) {
var wasprice = parseFloat(document.querySelector('.product-price__was').textContent.replace(pattern,"")) / 100;
var newPrice = parseFloat(document.querySelector('.product-price__discount').textContent.replace(pattern,"")) / 100;
var subtractPrice = (wasprice - newPrice);
var dividePrice = (subtractPrice / wasprice);
var multiplyPrice = (dividePrice * 100);
el.querySelector('.discountPercentage').innerHTML = multiplyPrice.toFixed(0) + "%";
}
});
.product-price__was {
text-decoration: line-through;
}
.product-price__discount {
color: red;
}
<div class="product-slab__price">
<div class="product-price__primary">
<span class="product-price__was">Was €10,00</span>
<span class="product-price__discount">Now €8,00</span>
<span class="discountPercentage" > </span>
</div>
</div>
<div class="product-slab__price">
<div class="product-price__primary">
<span class="product-price__was">€15,00</span>
<span class="product-price__discount">€10,00</span>
<span class="discountPercentage" > </span>
</div>
</div>
<div class="product-slab__price">
<div class="product-price__primary">
<span class="product-price__value">€15,90</span>
<span class="discountPercentage" > </span>
</div>
</div>
解决方法
问题可以在这里找到;
var wasPrice = parseFloat(document.querySelector('.product-price__was').textContent.replace(pattern,"")) / 100;
var newPrice = parseFloat(document.querySelector('.product-price__discount').textContent.replace(pattern,"")) / 100;
您正在使用 document.querySelector
,但是,您需要 el
提供的 forEach
元素,如下所示:
var wasPrice = parseFloat(el.querySelector('.product-price__was').textContent.replace(pattern,"")) / 100;
var newPrice = parseFloat(el.querySelector('.product-price__discount').textContent.replace(pattern,"")) / 100;
此外,为了防止 length
错误,请检查 querySelector
是否通过检查 null
而不是 .length
找到任何内容:
if (el.querySelector('.product-price__discount') !== null) {
看看这个改进的例子:
var pattern = /[^0-9\.]/g;
var price = document.querySelectorAll('.product-slab__price');
price.forEach(function(el){
if (el.querySelector('.product-price__discount') !== null) {
var wasPrice = parseFloat(el.querySelector('.product-price__was').textContent.replace(pattern,"")) / 100;
var newPrice = parseFloat(el.querySelector('.product-price__discount').textContent.replace(pattern,"")) / 100;
var discount = 100 - (newPrice / wasPrice) * 100;
el.querySelector('.discountPercentage').innerHTML = discount.toFixed(0) + "%";
}
});
.product-price__was {
text-decoration: line-through;
}
.product-price__discount {
color: red;
}
<div class="product-slab__price">
<div class="product-price__primary">
<span class="product-price__was">Was €10,00</span>
<span class="product-price__discount">Now €8,00</span>
<span class="discountPercentage" > </span>
</div>
</div>
<div class="product-slab__price">
<div class="product-price__primary">
<span class="product-price__was">€15,00</span>
<span class="product-price__discount">€10,00</span>
<span class="discountPercentage" > </span>
</div>
</div>
<div class="product-slab__price">
<div class="product-price__primary">
<span class="product-price__value">€15,90</span>
<span class="discountPercentage" > </span>
</div>
</div>
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