按下空格键后如何禁用文本区域中的退格键？

Question

document.getElementById("hello").onkeyup = function(e){
            var a = this.value; // to store the value of textarea
            if(e.keyCode == 32){ //if space bar is pressed
                if(e.keyCode == 8){
                    return false;
                }
            }
        }

如果按下空格键，我使用此代码禁用退格，但它不起作用

Answer 1

 flag = false; document.getElementById("hello").onkeydown = function(e) { var a = this.value; // to store the value of textarea if (flag && (e.keyCode === 8 || e.keyCode === 46)) { return false; } flag = e.keyCode === 32; // if space bar is pressed document.getElementById("nodel").classList.toggle("hide",!flag) }

 .hide { display:none }

 <textarea id="hello"></textarea> <span id="nodel" class="hide">Delete not allowed</span>