http://www.jb51.net/article/21191.htm
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>js read local file</title>
<script src="jquery.js"></script>
</head>
<body>
<input type="file" id="data" name="">
<a href="#" onclick="load()">Load</a>
<br/>
<div id="editor" contentEditable="true" style="height: 250px;"></div>
<script>
function load() {
var finput = document.getElementById("data");
// var editor = document.getElementById("editor");
var f = finput.files[0];
if(f){
var r = new FileReader();
r.onload = function(e){
var result = e.target.result;
if(result){
var errMsg = '';
var codeList = [];
var lines = result.split('\r\n');
for(var i=0; i<lines.length; i++){
var line = lines[i].split(',');
if(line[0] != '' && line[1] != ''){
codeList.push({"code": line[0],"weight": line[1]})
}else{
errMsg += ('Data format is incorrect: ' + line);
}
}
if(codeList.length > 0){
show(codeList);
}
if(errMsg != ''){
alert(errMsg);
}
}
}
r.readAsText(f);
}
// else{
// editor.InnerHTML = "Failed to load file";
// }
}
function show(codeList){
for(var i=0; i<codeList.length;i++){
console.log('line ' + i + ' code: ' + codeList[i].code + ' weight: ' + codeList[i].weight);
}
}
</script>
</body>
</html>