Javascript 字符串中的美元符号

发布于 2025-01-02 11:54:13 字数 598 浏览 0 评论 0原文

我想解析一个元素并按货币设置区域。

HTML：

<span id="price">¥82,84</span><br/>

Javascript：

        price = document.getElementById("price").innerHTML;
        price = price.slice(0,1);

        if(price == "€")
        {
            area = "europe";
        }
        if(price == "£")
        {
            area = "europe";
        }
        if(price == "\$")
        {
            area == "northamerica";
        }
        if(price == "\¥")
        {
            area == "asia";
        }

欧元和英镑有效，但日元和美元无效。有人有想法吗？

原文

I want to parse an an element and set the area by currency.

HTML:

<span id="price">¥82,84</span><br/>

Javascript:

        price = document.getElementById("price").innerHTML;
        price = price.slice(0,1);

        if(price == "€")
        {
            area = "europe";
        }
        if(price == "£")
        {
            area = "europe";
        }
        if(price == "\$")
        {
            area == "northamerica";
        }
        if(price == "\¥")
        {
            area == "asia";
        }

Euro and Pounds are working, but Yen and Dollar not. Does anyone have an idea?

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被翻牌 2025-01-09 11:54:13

您在应使用赋值运算符 = 的语句中使用了相等比较 ==。

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遗忘曾经 2025-01-09 11:54:13

.innerHTML 可能会返回 HTML 实体 $。请改用 .textContent 或 .innerText。另外，由于 price 不能是两个不同的字符，因此我建议使用嵌套的 else if 而不是多个 if。

错误本身位于美元和人民币区块：您使用的是 == 而不是普通的 =。

    price = document.getElementById("price").textContent; // or innerText for IE
    price = price.charAt(0); // equal to .slice(0,1);

    if(price == "€") {
        area = "europe";
    } else if(price == "£") {
        area = "europe";
    } else if(price == "$") {
        area = "northamerica";
    } else if(price == "¥") {
        area = "asia";
    } else { // Default
        area = "Unknown";
    }

还有另外两种方法：

切换块：

开关（价格）{
   案例 '€': 案例 '£':
       区域='欧洲'；
   休息;
   案例“$”：
       区域 = '北美';
   休息;
   案例 '¥'
       区域='亚洲'；
   休息;
   默认：
       面积='未知'；
}

哈希：

var Price = document.getElementById("price").textContent; //或内部文本（IE）
价格=价格.charAt(0);
var 价格到区域 = {
     '€': '欧洲',
     '£': '欧洲',
     '

: '北美', '¥': '亚洲' }; var 区域 = PriceToArea[价格] || '未知'; //默认未知

.innerHTML might return the HTML entities $. Use .textContent or .innerText instead. Also, since price cannot be two different chars, I suggest to use nested else ifs instead of multiple ifs.

The error itself is located at the dollar and yuan blocks: You are using == instead of a plain =.

    price = document.getElementById("price").textContent; // or innerText for IE
    price = price.charAt(0); // equal to .slice(0,1);

    if(price == "€") {
        area = "europe";
    } else if(price == "£") {
        area = "europe";
    } else if(price == "$") {
        area = "northamerica";
    } else if(price == "¥") {
        area = "asia";
    } else { // Default
        area = "Unknown";
    }

There are two other methods:

Switch blocks:

switch(price) {
   case '€': case '£':
       area = 'europe';
   break;
   case '

Hashes:
var price = document.getElementById("price").textContent; //or innerText (IE)
price = price.charAt(0);
var priceToArea = {
     '€': 'europe',
     '£': 'europe',
     '

: area = 'northamerica'; break; case '¥' area = 'asia'; break; default: area = 'unknown'; }Hashes:
: 'northamerica', '¥': 'asia' }; var area = priceToArea[price] || 'Unknown'; //Default Unknown

: area = 'northamerica'; break; case '¥' area = 'asia'; break; default: area = 'unknown'; }

Hashes:

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变身佩奇 2025-01-09 11:54:13

除了 Rob W 的回答之外，为了清楚起见，我还将使用 switch 语句：

switch (price)
{
    case "€":
    case "£":
        area = "europe";
        break;
    case "$":
        area = "northamerica";
        break;
    case "¥":
        area = "asia";
        break;
}

Further to Rob W's answer I would also use a switch statement for clarity:

switch (price)
{
    case "€":
    case "£":
        area = "europe";
        break;
    case "$":
        area = "northamerica";
        break;
    case "¥":
        area = "asia";
        break;
}

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