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// function compress_js(jscode){
//     // 关掉所有配置则会使用默认最大压缩方式处理
//     var ret = UglifyJS.minify(jscode, {
//         // toplevel: true, 
//         // mangle: { reserved: ['window'] }
//         ie8: true,
//         compress: { 
//             drop_debugger: false, 
//             hoist_vars: false, 
//             join_vars: false,
//             sequences: false,
//             inline: false,
//             loops: false,
//             reduce_funcs: false,
//             reduce_vars: false,
//             collapse_vars: false,
//             comparisons: false,
//             computed_props: false,
//             conditionals: true,
//             evaluate: true,
//             expression: false,
//         },
//         output: {
//             bracketize: true,
//             beautify: true,
//         },
//     })
//     return ret.code?ret.code:ret.error
// }

// var jscode = compress_js('console.log(123+333)')
// console.log(jscode)