js determines the uploaded file type and determines the FileUpload file type code_javascript skills

HTML tag code in asp.net:

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Common html tags:

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For ASP.NET or ordinary HTML tags, the following JS code is applicable:

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function CheckWorkFile()
{
var obj=document.getElementById('fuMain');
if(obj.value=='')
{
alert('Please select the assignment book file to upload');
return false;
}
var stuff=obj.value.match(/^(.*)(.)( .{1,8})$/)[3];
if(stuff!='doc')
{
alert('The file type is incorrect, please select the .doc file');
return false;
}
return true;
}