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    let userName = 'John'; function showMessage() { let message = 'Hello, ' + userName; alert(message); } showMessage(); // Hello, John 问下 ... 有区别了是吗? 另外,试了下window.userName却无法访问 谢谢~...
asked Jan 25, 2021 in Technique[技术] by 深蓝 (71.8m points)
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