装了nodejs, gulp。运行一个项目的时候报了以下错误：
gulp stderr >>>
gulp stderr >>>i\dashboard\node_modules\gulp-iconfont\node_modules\plexer\src\index.js:3
gulp stderr >>> const isStream = require('isstream');
gulp stderr >>> ^^^^^
gulp stderr >>> SyntaxError: Use of const in strict mode.
gulp stderr >>> at Module._compile (module.js:439:25)
gulp stderr >>> at Object.Module._extensions..js (module.js:474:10)
gulp stderr >>> at Module.load (module.js:356:32)
gulp stderr >>> at Function.Module._load (module.js:312:12)
gulp stderr >>> at Module.require (module.js:364:17)
gulp stderr >>> at require (module.js:380:17)
gulp stderr >>> at Object.<anonymous> (...node_modules\gulp-iconfont\src\index.js:3:16)
gulp stderr >>> at Module._compile (module.js:456:26)
gulp stderr >>> at Object.Module._extensions..js (module.js:474:10)
gulp stderr >>> at Module.load (module.js:356:32)
出错的语句是： const isStream = require('isstream');
谁能解答下？非常感谢！
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