如何使用javascript检测文件下载是完整的

how to detect that file download is Complete using javascript

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var StrPageName ="GPGeneration_Credit.ashx?UniqueID=" + __uniqueId +"&supplierID=" + supplierID +"&CreditID=" + OrderIds;
window.open(StrPageName);
// Here I want to detect that File download is Complete or not and then refresh the //page
location.reload();

请帮帮我，抱歉弄错了