js 或者 jquery 获取文本内容

first：

<!DOCTYPE html>  
<html>  
<head>  
<meta charset="UTF-8" />  
<script>  
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)  
            alert(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);   
        alert(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);   
        alert(xmlDoc.xml);  
    } else {   
        alert('error');   
    }   
}  
</script>  
<title>file upload</title>  
</head>  
<body>  
    <input type="file" onchange="upload(this)" />  
</body>  
</html>

two：

<!DOCTYPE html>
<html>
<head>
</head>
<body>
jsReadFile:<input type="file" onchange="jsReadFiles(this.files)"/>
<button onclick="jsReadFiles();">read</button>
</body>
<script src="./jquery.js"></script>
<script>
//js 读取文件
    function jsReadFiles(files) {
        if (files.length) {
            var file = files[0];
            var reader = new FileReader();//new一个FileReader实例
            if (/text+/.test(file.type)) {//判断文件类型，是不是text类型
                reader.onload = function() {
                    $('body').append('<pre>' + this.result + '</pre>');
                }
                reader.readAsText(file);
            } else if(/image+/.test(file.type)) {//判断文件是不是imgage类型
                reader.onload = function() {
                    $('body').append('<img src="' + this.result + '"/>');
                }
                reader.readAsDataURL(file);
            }
        }
    }
</script>
</html>

随机获取预设定的内容

var msg = ["./a.html","./b.html","./c.html"];
alert((msg[Math.floor(Math.random() * msg.length)]));

既不回头，何必不忘；既然无缘，何须誓言；今日种种，逝水无痕；明夕何夕，君已陌路；