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前端text树形文本转树形json 

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<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <script src="/js/jquery.js"></script>
    <meta charset="utf-8" />
</head>
<body>
    <textarea id="txtarea" rows="6"></textarea>
    <input type="button" onclick="convertToJson()" value="转换" />
    <textarea id="txtarearesult" rows="6"></textarea>
</body>
</html>
<script>
    function convertToJson() {
        var val = $("#txtarea").val();
        var lines = val.split('\n');
        var preNode = {};
        var resultJson = [];
        for (var i = 0; i < lines.length; i++) {
            var line = lines[i];
            var lastIndex = line.lastIndexOf("+");
            var text = line.substr(lastIndex + 1, line.length);
            var currentNode = { text: text, value: text, level: lastIndex, children: [] };
            if (lastIndex == -1) {
                resultJson.push(currentNode);
            } else if (lastIndex > preNode.level) {
                preNode.children.push(currentNode);
            } else {
                var node = getNodeBylevel(resultJson, lastIndex - 1);
                if (node) {
                    node.children.push(currentNode);
                } else {
                    resultJson.push(currentNode);
                }
            }

            preNode = currentNode;
        }

        $("#txtarearesult").val(JSON.stringify(resultJson));
        //alert(val);
    }

    function getNodeBylevel(nodes, level) {
        if (nodes && nodes[0].level == level) {
            return nodes[nodes.length - 1];
        } else {
            return getNodeBylevel(nodes[nodes.length - 1].children, level);
        }
    };
</script>