截取出url中文件名称

var str = "http://192.168.3.42:88/project/upload/2020/6/29/159341189921289_新建 XLS 工作表.xls";

  var arr = str.split("/");

  var c1= arr[arr.length-1];

  var index = c1.indexOf('_');

  console.log(index)

  console.log(c1)

  if(index != -1){

  c1 = c1.substring(index,c1.length)

  }

  console.log(c1)