D11117113江紫恩JavaScript執行輸入字串再反向輸出JS Code編輯Java

JavaScript輸出結果

江紫恩輸入字串:

JavaScript程式碼

lt=less then; gt=greater then;

<p>江紫恩輸入字串:<input type="text" len="50" id="in"></p>
<p><input type="button" value="江紫恩執行JavaScript" onclick="f()"></p>
<p id="out"></p>
<script>
function f(){
  var a = document.getElementById("in").value;/*取得id=in的文字*/
  var b = "源字串: "+a+ "<br>長度是:" + a.length + "<br>反串是: ";
  var c = "";
  for (var i = 0; i < a.length; i++)
    c = a.slice(i,i+1) + c ;
  b = b +"<font size=7>"+ c+"</font>";
  document.getElementById("out").innerHTML = b;
}
</script>