javascript - 我如何打印用户在javascript中点击的字母？

Question

欢迎

当用户单击代码中的每个按钮时，我需要显示一个警报框

示例:用户单击 H 按钮..警报必须显示 H 字母

这是代码

  var key = [["q","w","e","r","t","y","u","i","o","p"], ["a","s","d","f","g","h","j","k","l"], ["z","x","c","v","b","n","m"]];

  for(var i = 0; i < key.length; i++)


  function printchar()

      alert("here how i can print the letter i was clicked ?")



    document.write("<div>");
    for(var j = 0; j < key[i].length; j++)

       document.write("<input type='button' onclick='printchar()' value='" + key[i][j] + "'/>");

    document.write("</div>");

Answer 1

一个简短的方法是使用 forEach 迭代数组并创建按钮，将 onclick 添加到每个新创建的按钮。

var keys=['A','B','Z'];
keys.forEach(function(key){
    var btn=document.createElement('button');
    btn.onclick=function(){alert(this.innerHTML);};
   btn.innerHTML=key;
   document.body.appendChild(btn);
 });