Limite de caractères d'entrée Textarea (compatible avec iOS et Android)

Récemment, je travaille sur une page de compte public WeChat, qui a une limite sur le nombre de caractères saisis pour la zone de texte, et elle doit être compatible avec les téléphones iOS et Android. Je vais coller le code directement ci-dessous :

<span style="color: #0000ff"><!</span><span style="color: #ff00ff">DOCTYPE html</span><span style="color: #0000ff">></span>
<span style="color: #0000ff"><</span><span style="color: #800000">html </span><span style="color: #ff0000">lang</span><span style="color: #0000ff">="en"</span><span style="color: #0000ff">></span>

<span style="color: #0000ff"><</span><span style="color: #800000">head</span><span style="color: #0000ff">></span>
    <span style="color: #0000ff"><</span><span style="color: #800000">meta </span><span style="color: #ff0000">charset</span><span style="color: #0000ff">="UTF-8"</span><span style="color: #0000ff">></span>
    <span style="color: #0000ff"><</span><span style="color: #800000">title</span><span style="color: #0000ff">></span>textarea输入字数限制（兼容ios和安卓）<span style="color: #0000ff"></</span><span style="color: #800000">title</span><span style="color: #0000ff">></span>
<span style="color: #0000ff"></</span><span style="color: #800000">head</span><span style="color: #0000ff">></span>

<span style="color: #0000ff"><</span><span style="color: #800000">body</span><span style="color: #0000ff">></span>
    <span style="color: #008000"><!--</span><span style="color: #008000"> 最多输入10个字 </span><span style="color: #008000">--></span>
    <span style="color: #0000ff"><</span><span style="color: #800000">textarea </span><span style="color: #ff0000">placeholder</span><span style="color: #0000ff">="请输入家庭地址（必填）"</span><span style="color: #ff0000"> rows</span><span style="color: #0000ff">="2"</span><span style="color: #0000ff">></</span><span style="color: #800000">textarea</span><span style="color: #0000ff">></span>
    <span style="color: #0000ff"><</span><span style="color: #800000">textarea </span><span style="color: #ff0000">placeholder</span><span style="color: #0000ff">="请输入家庭地址（必填）"</span><span style="color: #ff0000"> rows</span><span style="color: #0000ff">="2"</span><span style="color: #0000ff">></</span><span style="color: #800000">textarea</span><span style="color: #0000ff">></span>
    <span style="color: #0000ff"><</span><span style="color: #800000">textarea </span><span style="color: #ff0000">placeholder</span><span style="color: #0000ff">="请输入家庭地址（必填）"</span><span style="color: #ff0000"> rows</span><span style="color: #0000ff">="2"</span><span style="color: #0000ff">></</span><span style="color: #800000">textarea</span><span style="color: #0000ff">></span>
    <span style="color: #0000ff"><</span><span style="color: #800000">textarea </span><span style="color: #ff0000">placeholder</span><span style="color: #0000ff">="请输入家庭地址（必填）"</span><span style="color: #ff0000"> rows</span><span style="color: #0000ff">="2"</span><span style="color: #0000ff">></</span><span style="color: #800000">textarea</span><span style="color: #0000ff">></span>
    <span style="color: #0000ff"><</span><span style="color: #800000">textarea </span><span style="color: #ff0000">placeholder</span><span style="color: #0000ff">="请输入家庭地址（必填）"</span><span style="color: #ff0000"> rows</span><span style="color: #0000ff">="2"</span><span style="color: #0000ff">></</span><span style="color: #800000">textarea</span><span style="color: #0000ff">></span>
    <span style="color: #0000ff"><</span><span style="color: #800000">textarea </span><span style="color: #ff0000">placeholder</span><span style="color: #0000ff">="请输入家庭地址（必填）"</span><span style="color: #ff0000"> rows</span><span style="color: #0000ff">="2"</span><span style="color: #0000ff">></</span><span style="color: #800000">textarea</span><span style="color: #0000ff">></span>
    <span style="color: #0000ff"><</span><span style="color: #800000">script</span><span style="color: #0000ff">></span>
    <span style="background-color: #f5f5f5; color: #0000ff">var</span><span style="background-color: #f5f5f5; color: #000000"> textarea </span><span style="background-color: #f5f5f5; color: #000000">=</span><span style="background-color: #f5f5f5; color: #000000"> document.getElementsByTagName(</span><span style="background-color: #f5f5f5; color: #000000">'</span><span style="background-color: #f5f5f5; color: #000000">textarea</span><span style="background-color: #f5f5f5; color: #000000">'</span><span style="background-color: #f5f5f5; color: #000000">);
    </span><span style="background-color: #f5f5f5; color: #0000ff">for</span><span style="background-color: #f5f5f5; color: #000000"> (</span><span style="background-color: #f5f5f5; color: #0000ff">var</span><span style="background-color: #f5f5f5; color: #000000"> i </span><span style="background-color: #f5f5f5; color: #000000">=</span> <span style="background-color: #f5f5f5; color: #000000">0</span><span style="background-color: #f5f5f5; color: #000000">; i </span><span style="background-color: #f5f5f5; color: #000000"><</span><span style="background-color: #f5f5f5; color: #000000"> textarea.length; i</span><span style="background-color: #f5f5f5; color: #000000">++</span><span style="background-color: #f5f5f5; color: #000000">) {
        textarea[i].oninput </span><span style="background-color: #f5f5f5; color: #000000">=</span> <span style="background-color: #f5f5f5; color: #0000ff">function</span><span style="background-color: #f5f5f5; color: #000000">() {</span><span style="background-color: #f5f5f5; color: #008000">//</span><span style="background-color: #f5f5f5; color: #008000">注意，这里要用oninput,不要用onkeyup,否则iOS系统不支持</span>
            <span style="background-color: #f5f5f5; color: #0000ff">this</span><span style="background-color: #f5f5f5; color: #000000">.value </span><span style="background-color: #f5f5f5; color: #000000">=</span> <span style="background-color: #f5f5f5; color: #0000ff">this</span><span style="background-color: #f5f5f5; color: #000000">.value.substring(</span><span style="background-color: #f5f5f5; color: #000000">0</span><span style="background-color: #f5f5f5; color: #000000">, </span><span style="background-color: #f5f5f5; color: #000000">10</span><span style="background-color: #f5f5f5; color: #000000">);
        }
    }
    </span><span style="color: #0000ff"></</span><span style="color: #800000">script</span><span style="color: #0000ff">></span>
<span style="color: #0000ff"></</span><span style="color: #800000">body</span><span style="color: #0000ff">></span>

<span style="color: #0000ff"></</span><span style="color: #800000">html</span><span style="color: #0000ff">></span>

Pièges rencontrés : Je viens de commencer à utiliser onkeyup et j'ai constaté que le système iOS ne le supporte pas, je suis passé à oninput et j'ai testé OK.

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