劉任昌JavaScript,input,text,getElementById.

JavaScript輸出與輸入

輸入字串:

JavaScript輸出與輸入的程式碼

<p>輸入字串:<input type="text" len="50" id="in"></p>

<p><input type="button" value="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 = "原字串: "+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;/*輸出html指令*/

}

</script>

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