js反混淆

var esprima = require('esprima')
var escodegen = require('escodegen')
content = "function _0x355d23(_0x450614) {
                if (('' + _0x450614 / _0x450614)[_0x55f3('0x1c', 'x56x32x4bx45')] !== 0x1 || _0x450614 % 0x14 === 0x0) {
                    (function() {}
                    [_0x55f3('0x1d', 'x43x4ex55x59')]((undefined + '')[0x2] + (!![] + '')[0x3] + ([][_0x55f3('0x1e', 'x77x38x50x52')]() + '')[0x2] + (undefined + '')[0x0] + (![] + [0x0] + String)[0x14] + (![] + [0x0] + String)[0x14] + (!![] + '')[0x3] + (!![] + '')[0x1])());
                } else {
                    (function() {}
                    ['x63x6fx6ex73x74x72x75x63x74x6fx72']((undefined + '')[0x2] + (!![] + '')[0x3] + ([][_0x55f3('0x1f', 'x4cx24x28x44')]() + '')[0x2] + (undefined + '')[0x0] + (![] + [0x0] + String)[0x14] + (![] + [0x0] + String)[0x14] + (!![] + '')[0x3] + (!![] + '')[0x1])());
                }
                _0x355d23(++_0x450614);
            }"

function formatJS(){ //context是要格式的js
    var ast=esprima.parseScript(content.toString());
    var ast_to_json=JSON.stringify(ast);
    console.log(ast_to_json);
    var ast1=JSON.parse(ast_to_json);
    var code=escodegen.generate(ast1);
    console.log(code);
    return code;
}

formatJS()

在线生成AST语法树
http://esprima.org/demo/parse.html