关于javascript:js-截取文件后缀名

办法一:

<input type="file" onChange="change(event)"><script>function change(event) {    var fileName = event.target.files[0].name.toLowerCase();    var lastIndex = fileName.lastIndexOf('.');    var suffix = fileName.substring(lastIndex, fileName.length);    console.log(suffix);}</script>

办法二:

<input type="file" onChange="change(event)"><script>function change(event) {    var fileName = event.target.files[0].name.toLowerCase();    var suffix = fileName.split('.').pop();    console.log(suffix);}</script>

办法三:

<input type="file" onChange="change(event)"><script>function change(event) {    var fileName = event.target.files[0].name.toLowerCase();    var suffix = fileName.match(/.[^.]+$/)[0];    console.log(suffix);}