a download attribute element

Before php plugin has been used to complete the file download function, see the project code today, to see can be downloaded through the download of a property, the code is as follows:

html part of the code:

<a onclick='downloadData'>download</a>

 js part of the code:

function downloadData(){
    // 使用a的download属性下载文件
    var filename = '文件名称';
    var data = '数据';
    var blob = new Blob([data],{type:'application/vnd.ms-excel'})
    var a = document.createElement('a');//创建a元素
    a.href = URL.createObjectURL(blob);
    a.download = filename;
    a.click();//触发a的点击事件
    //URL.revokeObjectUrl(a.href)
    a = null;
}

chrome Use this code to run properly on and download the file; but for use on firefox, can not download the file.

Phpexcel had wanted to use plug-ins to rewrite this function, think about it, after all, the project requires not so high, and then look for or have any good solutions.

Just find a way tried, modify the code as follows (using the code rewrite jq no effect, Firefox can not trigger a click event):

<a onclick='downloadData'>download</a>
<a id='dd' style='display:none;'></a>

//以下使用jq写法，使用前请先引入jQuery。
function downloadData(){
    var filename = '文件名称';
    var data = '数据';
    var blob = new Blob([data],{type:'application/vnd.ms-excel'})
    $('#dd').attr('href',URL.createObjectURL(blob));
    $('#dd').attr('download',filename);
    $('#dd').trigger('click');
}

Continue to look for other ways, as follows (not found error message looks like Firefox):

<a onclick='downloadData'>download</a>

function downloadData(){
    var data = '数据';
    var blob = new Blob([data],{type:'application/vnd.ms-excel'})
    var a = document.createElement('a');//创建元素
    var event = new MouseEvent('click');
    a.download = '文件名称';
    a.href = URL.createObjectURL(blob);
    a.target = '_blank';
    a.dispatchEvent(event);//分发事件
}

Next, to determine the type of browser through window.navigator.userAgent, for example, to determine whether the Firefox browser:

var explorer =window.navigator.userAgent ;if(explorer.indexOf("Firefox")>=0){return '火狐';}

Reference https://segmentfault.com/q/1010000011634405/a-1020000011684880

       https://juejin.im/post/5b30d1c7e51d455e2c32f9b0

       https://blog.csdn.net/qq_35661171/article/details/79242114