JS中获取文件点之后的后缀字符
var FileName = $("#file").val();
var index1=FileName.lastIndexOf(".");
var index2=FileName.length;
var suffix=FileName.substring(index1, index2);//后缀名
var FileName = $("#file").val();
var index1=FileName.lastIndexOf(".");
var index2=FileName.length;
var suffix=FileName.substring(index1, index2);//后缀名