如果占位符的属性值包含斜杠和空格，如何使用 querySelectorAll 按属性值计算 select

Question

Let me explain example

<input placeholder='MM / YY'>

My query is document.querySelectorAll('[placeholder=MM \/ YY]') .

But it throws error Failed to execute 'querySelectorAll' on 'Document': '[placeholder=MM / YY]' is not a valid selector.

Answer 1

Add quotes around the attribute value:

 console.log( document.querySelector('[placeholder="MM \/ YY"]') );

 <input placeholder='MM / YY'>