function readExcel(file_obj){
var myIndex = layer.load(2, {
shade : [ 0.3, '#C8C8C8' ]
});
var reader = new FileReader();
var file = file_obj.files[0];
reader.readAsBinaryString(file);
reader.onload = function (e) {
var data = e.target.result;
var wb = XLSX.read(data, {type: 'binary'});
sheetName = wb.SheetNames[0] // 获取文档中第一个sheet页签的名字
sheets = wb.Sheets[sheetName] // 获sheet名页签下的数据
var array=XLSX.utils.sheet_to_json(sheets)
