魏靖容JavaScript,input,text,getElementById.

JavaScript輸出輸入

輸入字串:

JavaScript輸出與輸入程式碼

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

<p><input onclick="f()" type="button" value="執行JavaScript" /></p>

<p id="out"></p>

<script>

function f(){

  var a = document.getElementById("in").value;/*取得id=in的文字*/

  var b = "長度是:" + a.length + ",反串是: ";

  var c = "";

  for (var i = 0; i < a.length; i++)

    c = a.slice(i,i+1) + c ;

  b = b + c;

  document.getElementById("out").innerHTML = b;

}

</script>

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