javascript – onclick不适用于按钮输入

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这很简单：

    var previous = document.createElement("input");
    previous.type = "button";
    previous.value = "<-";
    previous.className = "leftBtn";
    previous.onclick = function(){
        console.log("CLICK");
    };

它不会在控制台中显示单击.如果我尝试使用chrome dev工具将其直接放在输入标题中,它会输出文本,因此我知道按钮有效.当我用javascript分配函数时,我只是不知道为什么它不起作用.

编辑：

function createCalandar(id, year, month){
    var date = new Date(year, month, 0);
    var daysInMonth = date.getDate();
    console.log(id+" "+year+" "+month);
    
    var size = Math.sqrt(daysInMonth);
    
    var currentDay = 1;
    var header = document.createElement("div");
    header.className = "staticHeader";
    var previous = document.createElement("input");
    previous.type = "button";
    previous.value = "<-";
    previous.className = "leftBtn";
    previous.onclick = function(){
        console.log("CLICK");
     
    };
    
    var next = document.createElement("input");
    next.type = "button";
    next.value = "->";
    next.className = "rightBtn";
    
    header.appendChild(previous);
    header.appendChild(next);
    
    var table = document.createElement("table");
    table.className = "calandar";
    for(var x=0; x < size; x++){
        var row = document.createElement("tr");
        for(var y=0; y < size; y++){
            var col = document.createElement("td");
            row.appendChild(col);
            if(currentDay <= daysInMonth){
                col.innerHTML = currentDay;
                col.onclick = function(e){
                    console.log(currentDay);
                }

            }
            
            currentDay++;
        }
        table.appendChild(row)
    }
    
    var htmlLocation = document.getElementById(id);
    htmlLocation.innerHTML = header.outerHTML+"<br />"+table.outerHTML;
   
}

function createCalandarNow(id){
    var date = new Date();
    createCalandar(id, date.getYear(), date.getMonth());
}

function nextCalandar(){
    
}

function lastCalandar(){
    
}


createCalandarNow("calandar");

html,body{
    margin:0;
    padding:0;
}
#calandar{
    position:absolute;
    right:10;
    bottom:20;
    width:200;
    height:200;
}
#calandar input{
    width:50%;
    cursor:pointer;
}
#calandar .leftBtn{
    position:absolute;
    
    left:0;
}
#calandar .rightBtn{
    position: absolute;
    right:0;
    
}
.calandar{

  
    border:1px solid gray;
    width:100%;
    height:100%;
    text-align: center;
}

.calandar td{
    border:1px solid white;
   

    
}
.calandar td:hover{
     background-color:lightgray;
    cursor:pointer;

}

.calandar .staticHeader{
    position:static;
}

<title>Scheduler</title>


<div id="content">
    <div id="calandar">
    
    </div>
</div>

解决方法:

When you use innerHTML the element’s content gets reparsed. The
elements are removed and recreated, which in turn removes the event
handler. Much better would be to use DOM manipulation.

function createCalandar(id, year, month) {
  var date = new Date(year, month, 0);
  var daysInMonth = date.getDate();
  console.log(id + " " + year + " " + month);

  var size = Math.sqrt(daysInMonth);

  var currentDay = 1;
  var header = document.createElement("div");
  header.className = "staticHeader";
  var previous = document.createElement("input");
  previous.type = "button";
  previous.value = "<-";
  previous.className = "leftBtn";
  previous.addEventListener("click", function() {
    console.log("CLICK");

  });

  var next = document.createElement("input");
  next.type = "button";
  next.value = "->";
  next.className = "rightBtn";

  header.appendChild(previous);
  header.appendChild(next);

  var table = document.createElement("table");
  table.className = "calandar";
  for (var x = 0; x < size; x++) {
    var row = document.createElement("tr");
    for (var y = 0; y < size; y++) {
      var col = document.createElement("td");
      row.appendChild(col);
      if (currentDay <= daysInMonth) {
        col.innerHTML = currentDay;
        col.onclick = function(e) {
          console.log(currentDay);
        }

      }

      currentDay++;
    }
    table.appendChild(row)
  }

  var htmlLocation = document.getElementById(id);
  //htmlLocation.innerHTML = header.outerHTML+"<br />"+table.outerHTML;

  htmlLocation.appendChild(header);
  htmlLocation.appendChild(document.createElement("br"));
  htmlLocation.appendChild(table);

}

function createCalandarNow(id) {
  var date = new Date();
  createCalandar(id, date.getYear(), date.getMonth());
}

function nextCalandar() {

}

function lastCalandar() {

}


createCalandarNow("calandar");

html,
body {
  margin: 0;
  padding: 0;
}
#calandar {
  position: absolute;
  right: 10;
  bottom: 20;
  width: 200;
  height: 200;
}
#calandar input {
  width: 50%;
  cursor: pointer;
}
#calandar .leftBtn {
  position: absolute;
  left: 0;
}
#calandar .rightBtn {
  position: absolute;
  right: 0;
}
.calandar {
  border: 1px solid gray;
  width: 100%;
  height: 100%;
  text-align: center;
}
.calandar td {
  border: 1px solid white;
}
.calandar td:hover {
  background-color: lightgray;
  cursor: pointer;
}
.calandar .staticHeader {
  position: static;
}

<title>Scheduler</title>


<div id="content">
  <div id="calandar">

  </div>
</div>

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