JavaScript flow control basics and cases

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        //1 if的语法结构  如果 if 
        // 
        // if(条件表达式) {  // 大括号
        // 执行语句
        // }
        //2 执行思路  如果if里面的条件表达式为真 TRUE 则执行大

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Origin blog.csdn.net/chenggong9527/article/details/123631097