美元符号Javascript字符串

Question

我想解析一个元素并按货币设置区域.

HTML:

<span id="price">¥82,84</span><br/>

使用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";
        }

欧元和英镑都在运作,但日元和美元没有.有没有人有想法？

Answer 1

您==在应使用赋值运算符的语句中使用相等比较=.

Answer 2

.innerHTML可能会返回HTML实体$.使用.textContent或.innerText代替.另外,由于price不能是两个不同的字符,我建议使用嵌套的else ifs代替多个ifs.

错误本身位于美元和人民币块:您正在使用==而不是平原=.

    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:

• 开关块:

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

• 哈希表:

  var price = document.getElementById("price").textContent; //or innerText (IE)
  price = price.charAt(0);
  var priceToArea = {
       '€': 'europe',
       '£': 'europe',
       '$': 'northamerica',
       '¥': 'asia'
  };
  var area = priceToArea[price] || 'Unknown'; //Default Unknown