我正在尝试foreach在HTML表中调用循环以返回与行相同的数字作为foreach返回值，但我一直在接收undefined表行应在的位置。
这有效：
Object.keys(tickets).forEach(function (key) {
let ticketCount = tickets[key]
ticketType = ticketType + key + " x" + ticketCount + "\n"
});
这不起作用：
const mailOptions = {
from: '[email protected]',
to: email,
subject: 'title',
html: `<tr>
<td align="left" bgcolor="#ffffff" style="padding: 24px; font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px;">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td align="left" bgcolor="#00B6FF" width="75%" style="padding: 12px;font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px;"><strong>Order #</strong></td>
<td align="left" bgcolor="#00B6FF" width="25%" style="padding: 12px;font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px;"><strong>0000224</strong></td>
</tr>
${Object.keys(tickets).forEach(function (key) {
`
<tr>
<td align="left" width="75%" style="padding: 6px 12px;font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px;">Item</td>
<td align="left" width="25%" style="padding: 6px 12px;font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px;">$150</td>
</tr>
`
})}
<tr>
<td align="left" width="75%" style="padding: 12px; font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px; border-top: 2px dashed #D2C7BA; border-bottom: 2px dashed #D2C7BA;"><strong>Total</strong></td>
<td align="left" width="25%" style="padding: 12px; font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px; border-top: 2px dashed #D2C7BA; border-bottom: 2px dashed #D2C7BA;"><strong>$${totalPrice}</strong></td>
</tr>
</table>
</td>
</tr>`
我刚刚在@PatrickHollweck代码中添加了验证，请检查一下。
const tickets = { "Item-1": "20" };
const totalPrice = 10;
const entries = (tickets && Object.keys(tickets) && Object.keys(tickets).map(function (key) {
return `
<tr>
<td align="left" width="75%" style="padding: 6px 12px;font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px;">${key}</td>
<td align="left" width="25%" style="padding: 6px 12px;font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px;">${tickets[key]}</td>
</tr>
`
}).join(""));
const html = `<tr>
<td align="left" bgcolor="#ffffff" style="padding: 24px; font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px;">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td align="left" bgcolor="#00B6FF" width="75%" style="padding: 12px;font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px;"><strong>Order #</strong></td>
<td align="left" bgcolor="#00B6FF" width="25%" style="padding: 12px;font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px;"><strong>0000224</strong></td>
</tr>
${entries}
<tr>
<td align="left" width="75%" style="padding: 12px; font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px; border-top: 2px dashed #D2C7BA; border-bottom: 2px dashed #D2C7BA;"><strong>Total</strong></td>
<td align="left" width="25%" style="padding: 12px; font-family: 'Source Sans Pro', Helvetica, Arial, sans-serif; font-size: 16px; line-height: 24px; border-top: 2px dashed #D2C7BA; border-bottom: 2px dashed #D2C7BA;"><strong>$${totalPrice}</strong></td>
</tr>
</table>
</td>
</tr>`;
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我来说两句