Luat Console，调试神器！

                    <p style="outline: 0px; padding: 0px; margin-bottom: 16px; font-size: 16px; color: rgb(79, 79, 79); line-height: 26px; text-align: justify; word-break: break-all; font-family: -apple-system, " sf="" ui="" text",="" arial,="" "pingfang="" sc",="" "hiragino="" sans="" gb",="" "microsoft="" yahei",="" "wenquanyi="" micro="" hei",="" sans-serif;="" font-variant-ligatures:="" common-ligatures;"="">前言：这次教大家使用Luat的console功能，如果使用过MicroPython，应该对console很熟悉。console，顾名思义，控制台，能做什么？ 理论上在脚本运行的功能都可以在控制台执行。有什么好处？举个简单的例子：反转一个字符串，按照之前的步骤，写一个脚本，下载进模块，成功，万事大吉。失败，从头再来。这样的操作很繁琐。</p><p style="outline: 0px; padding: 0px; margin-bottom: 16px; font-size: 16px; color: rgb(79, 79, 79); line-height: 26px; text-align: justify; word-break: break-all; font-family: -apple-system, " sf="" ui="" text",="" arial,="" "pingfang="" sc",="" "hiragino="" sans="" gb",="" "microsoft="" yahei",="" "wenquanyi="" micro="" hei",="" sans-serif;="" font-variant-ligatures:="" common-ligatures;"="">那么使用了console，就可以这样玩</p><p style="outline: 0px; padding: 0px; margin-bottom: 16px; font-size: 16px; color: rgb(79, 79, 79); line-height: 26px; text-align: justify; word-break: break-all; font-family: -apple-system, " sf="" ui="" text",="" arial,="" "pingfang="" sc",="" "hiragino="" sans="" gb",="" "microsoft="" yahei",="" "wenquanyi="" micro="" hei",="" sans-serif;="" font-variant-ligatures:="" common-ligatures;"=""><img src="http://oldask.openluat.com/image/show/attachments-2018-09-jp4zWo8N5b9c6c288acc9.jpg" class="img-responsive" style="color: rgb(0, 0, 0); font-size: 14px; text-align: start; width: 486px;"></p><div><br></div><p style="outline: 0px; padding: 0px; margin-bottom: 16px; font-size: 16px; color: rgb(79, 79, 79); line-height: 26px; text-align: justify; word-break: break-all; font-family: -apple-system, " sf="" ui="" text",="" arial,="" "pingfang="" sc",="" "hiragino="" sans="" gb",="" "microsoft="" yahei",="" "wenquanyi="" micro="" hei",="" sans-serif;="" font-variant-ligatures:="" common-ligatures;"="">这里写图片描述</p><p style="outline: 0px; padding: 0px; margin-bottom: 16px; font-size: 16px; color: rgb(79, 79, 79); line-height: 26px; text-align: justify; word-break: break-all; font-family: -apple-system, " sf="" ui="" text",="" arial,="" "pingfang="" sc",="" "hiragino="" sans="" gb",="" "microsoft="" yahei",="" "wenquanyi="" micro="" hei",="" sans-serif;="" font-variant-ligatures:="" common-ligatures;"="">如果手抖打错一个单词，不要着急，再输入一遍即可。</p><p style="outline: 0px; padding: 0px; margin-bottom: 16px; font-size: 16px; color: rgb(79, 79, 79); line-height: 26px; text-align: justify; word-break: break-all; font-family: -apple-system, " sf="" ui="" text",="" arial,="" "pingfang="" sc",="" "hiragino="" sans="" gb",="" "microsoft="" yahei",="" "wenquanyi="" micro="" hei",="" sans-serif;="" font-variant-ligatures:="" common-ligatures;"="">所以，使用console，提高调试的效率，加快开发速度。</p><p style="outline: 0px; padding: 0px; margin-bottom: 16px; font-size: 16px; color: rgb(79, 79, 79); line-height: 26px; text-align: justify; word-break: break-all; font-family: -apple-system, " sf="" ui="" text",="" arial,="" "pingfang="" sc",="" "hiragino="" sans="" gb",="" "microsoft="" yahei",="" "wenquanyi="" micro="" hei",="" sans-serif;="" font-variant-ligatures:="" common-ligatures;"=""><img src="http://oldask.openluat.com/image/show/attachments-2018-09-CXctRBd05b9c6c9c1d1f8.jpg" class="img-responsive" style="color: rgb(0, 0, 0); font-size: 14px; text-align: start; width: 498.4px; height: 297.631px;"></p><p style="outline: 0px; padding: 0px; margin-bottom: 16px; font-size: 16px; color: rgb(79, 79, 79); line-height: 26px; text-align: justify; word-break: break-all; font-family: -apple-system, " sf="" ui="" text",="" arial,="" "pingfang="" sc",="" "hiragino="" sans="" gb",="" "microsoft="" yahei",="" "wenquanyi="" micro="" hei",="" sans-serif;="" font-variant-ligatures:="" common-ligatures;"="">使用console功能，需要在main.lua里面加入</p><pre class="prettyprint" style="outline: 0px; padding: 8px 16px 6px 56px; margin-bottom: 24px; font-family: Consolas, Inconsolata, Courier, monospace; font-size: 14px; position: relative; overflow-y: hidden; line-height: 22px; color: rgb(0, 0, 0); background-color: rgb(40, 44, 52); border-width: initial; border-style: none; border-color: initial; font-variant-ligatures: common-ligatures;"><code class="has-numbering" style="outline: 0px; font-family: Consolas, Inconsolata, Courier, monospace; font-size: 14px; padding: 0.5em; line-height: 22px; color: rgb(171, 178, 191); background-color: rgb(40, 44, 52); border-radius: 4px; display: block; overflow-x: auto; white-space: pre; word-wrap: normal; text-size-adjust: none; word-break: break-all;">require "console"

console.setup(1, 115200) – 设置为串口1，波特率为115200

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newfenv = {                     -- 沙盒新环境，并重写print函数。
    print = function( ... )
        print(arg[1].."test")
    end
}               

setmetatable(newfenv,{__index = _G})        –新环境继承_G全局表
–xpcall捕捉脚本异常
xpcall(function()
    local line = “print(1)”
    local f = loadstring(line)
    setfenv(f, newfenv)     –在沙盒中执行f()函数
    f()
end,
function() – 错误输出
   print(debug.traceback())
end
)
–输出结果  1test
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f = loadstring("a = 1")   -- 相当于 function () a = 1 end，返回值为function类型
f()     --执行函数
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