javascriptタイプ変換例

842 ワード

 
  
<br>    var i="123abc"; <br>    i=parseInt(i);// <br>    alert(i+","+typeof(i));// :123,number <br>    i="12.3abc"; <br>    i=parseFloat(i);// <br>    alert(i+","+typeof(i));// :12.3,number( int float number ) <br>    i="a123abc"; <br>    i=parseInt(i);// <br>    alert(i+","+typeof(i));// :NaN,number ( , “ ,Not a Number”) <br>    var num=document.getElementById("num").value; <br>    function showMsg(num) <br>    { <br>        for(var i=0;i<num;i++) <br>        { <br>            document.write(" ,JavaScript!<br/>"); <br>        } <br>    } <br>