js前端读写文件的方法（json、excel）

<input tabindex="-1" id="select_range" data-input="false" class="font-small" type="file">

$(‘#select_range‘).change(function(evt){
        var files = evt.target.files,
            reader = new FileReader();
            reader.onload = function(){
                var range=‘XXXXXXXXXX‘;
             
            };
        reader.readAsText(files[0]);
    });

<a href="javascript:void(0)" id="aa">保存</a>

function fake_click(obj) {
        var ev = document.createEvent("MouseEvents");
        ev.initMouseEvent(
            "click", true, false, window, 0, 0, 0, 0, 0
            , false, false, false, false, 0, null
        );
        obj.dispatchEvent(ev);
    }

//name-文件名；data-要保存的字符串。
function export_raw(name, data) {
        var urlObject = window.URL || window.webkitURL || window;
        var export_blob = new Blob([data]);
        var save_link = document.createElementNS("http://www.w3.org/1999/xhtml", "a");
        save_link.href = urlObject.createObjectURL(export_blob);
        save_link.download = name;
        fake_click(save_link);
    }
//点击按钮

$(‘#aa‘).click(function() {
    var data=“要保存的文本”；
    export_raw(‘range.json‘, data);
   
};