<input type="file" onchange="upload(this)" />

     function upload(input) {               //支持chrome IE10               if (window.FileReader) {                   var file = input.files[0];                   filename = file.name.split(".")[0];                   var reader = new FileReader();                   reader.onload = function() {                       console.log(this.result);                   }                   reader.readAsText(file);               }                //支持IE 7 8 9 10               else if (typeof window.ActiveXObject != 'undefined'){                   var xmlDoc;                    xmlDoc = new ActiveXObject("Microsoft.XMLDOM");                    xmlDoc.async = false;                    xmlDoc.load(input.value);                    console.log(xmlDoc.xml);                }                //支持FF               else if (document.implementation && document.implementation.createDocument) {                    var xmlDoc;                    xmlDoc = document.implementation.createDocument("", "", null);                    xmlDoc.async = false;                    xmlDoc.load(input.value);                    console.log(xmlDoc.xml);               } else {                    alert('error');                }            }   //////////////////////////////////////////////////////////// <input type="file" onchange="abc(this)" /> abc=(file)=>{                 var reader = new FileReader();           reader.readAsText(file.files[0])         console.log(reader)     }