如果要发送一个只包含换行符的文本

use this %0a

link =`whatsapp://send?text=%0a‎Hello%0aWorld`;

如果你想发送一些url链接，文本中包含换行符

var encodedURL = encodeURIComponent(some_url);
link =`whatsapp://send?text=${encodedURL}%0a‎Hello%0aWorld`;

现在将此链接嵌入到锚标记中

<a href=link> Click here! </a>

要在WhatsApp中创建换行符，您可以使用以下命令。它运行良好，我正在使用它：

use `%0a`

例如：

smsContain = "*Greetings from  " + cname + " ,%0a %0aM/s. " + txtName.Text + " %0a %0aYour Bill for Advertisement is generated ; %0a %0aBill Date  :-  " + DateTime.ParseExact(dateTimePicker1.Text, "dd/MM/yyyy", null).ToString("dd/MM/yyyy") + " %0a %0aBill no  :-  " + lblBillNo.Text + "  %0a %0aBilling Amount of Rs.  " + lblNet_Amt.Text + " %0a %0aAdvertisement Published in  " + news + " in " + Edi + "  edition,%0a %0aReleased Date : " + DateTime.ParseExact(DateTime.Parse(dt).ToShortDateString(), "dd/MM/yyyy", null).ToString("dd/MM/yyyy") + ".%0a %0aPlease find the Bill attached below, and request you to please  release the payment ASAP. %0a %0a %0aAny descripancy in regards to this Bill to reported to us immediately.%0a %0a %0aAlways at your Service....* ";
                smsContain = smsContain.Replace("&", "+%26+");

https://wa.me/+99123456789?text=Line%0aBreak
%0a表示换行符

我有一个可行的解决方案：
于飞：

$_u.="Product Name:".$_productName."\n";
$_u.="Sku:".$_productSku."\n";

<a data-text="<?php echo $_u; ?>" data-link="" class="whatsapp">Share</a>

JS：

var isMobile = {
                Android: function() {
                    return navigator.userAgent.match(/Android/i);
                },
                BlackBerry: function() {
                    return navigator.userAgent.match(/BlackBerry/i);
                },
                iOS: function() {
                    return navigator.userAgent.match(/iPhone|iPad|iPod/i);
                },
                Opera: function() {
                    return navigator.userAgent.match(/Opera Mini/i);
                },
                Windows: function() {
                    return navigator.userAgent.match(/IEMobile/i);
                },
                any: function() {
                    return (isMobile.Android() || isMobile.BlackBerry() || isMobile.iOS() || isMobile.Opera() || isMobile.Windows());
                }
                };
                $(document).on("click", '.whatsapp', function() {
                    if( isMobile.any() ) {

                        var text = $(this).attr("data-text");
                        var url = $(this).attr("data-link");
                        var message = encodeURIComponent(text) + " - " + encodeURIComponent(url);
                        var whatsapp_url = "whatsapp://send?text=" + message;
                        window.location.href = whatsapp_url;
                    } else {
                        alert("Please share this in mobile device");
                    }

                });

这里有一个解决方案，基本上是使用：

whatsappMessage = window.encodeURIComponent(whatsappMessage)

尝试使用
。这是一个特殊的HTML代码。
例如：
你好！你今天好吗？
会得到这样的结果：
你好啊！
你今天好吗？