强制类型数值类型转换

游鹄君2025年4月30日小于 1 分钟

示例代码

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>强制数据类型转换</title>
</head>
<body>
  <script type="text/javascript">
  //parseInt();
  var a="100px";
  var aa=parseInt(a);
  console.log(aa);
  var b="200abc";
  var bb=parseInt(b);
  console.log(bb);
  var c="abc200";
  var cc=parseInt(cc);
  console.log(cc);
 
  //parseFloat();
  var e='3.14';
  var ee=parseInt(e);
  console.log(ee);
 
  var f='3.14abc';
  var ff=parseInt(f);
  console.log(ff);
 
  var g='abc3.14';
  var gg=parseInt(g);
  console.log(gg);
 
  //Number();
  var h='340';
  var hh=Number(h);
 
  console.log(hh);
  console.log(typeof(hh));
 
  var i="234abc";
  var ii=Number(i);
 
  console.log(ii);
  console.log(typeof(ii));
 
  var j=false;
  var jj=Number(j);
 
  console.log(jj);
  console.log(typeof(jj));
 
 
  //数值自身互换
  var k="3.14";
 
  var kk=parseInt(k);
 
  console.log(kk);
 
  var l="100";
 
  var ll=parseFloat(l);
 
  console.log(ll);
 
  </script>
</body>
</html>