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)
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