js下载文件

Posted 2020-10-11 张书达

window.downloadFile = function (sUrl) {

 

//ios devices do not support downloading. We have to inform user about this.

if (/(iP)/g.test(navigator.userAgent)) {

alert(‘Your device does not support files downloading. Please try again in desktop browser.‘);

return false;

}

 

//If in Chrome or Safari - download via virtual link click

if (window.downloadFile.isChrome || window.downloadFile.isSafari) {

//Creating new link node.

var link = document.createElement(‘a‘);

link.href = sUrl;

 

if (link.download !== undefined) {

//Set html5 download attribute. This will prevent file from opening if supported.

var fileName = sUrl.substring(sUrl.lastIndexOf(‘/‘) + 1, sUrl.length);

link.download = fileName;

}

 

//Dispatching click event.

if (document.createEvent) {

var e = document.createEvent(‘MouseEvents‘);

e.initEvent(‘click‘, true, true);

link.dispatchEvent(e);

return true;

}

}

 

// Force file download (whether supported by server).

if (sUrl.indexOf(‘?‘) === -1) {

sUrl += ‘?download‘;

}

 

window.open(sUrl, ‘_self‘);

return true;

}

 

window.downloadFile.isChrome = navigator.userAgent.toLowerCase().indexOf(‘chrome‘) > -1;

window.downloadFile.isSafari = navigator.userAgent.toLowerCase().indexOf(‘safari‘) > -1;