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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
JavaScript flow control basics and cases
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Origin blog.csdn.net/chenggong9527/article/details/123631097
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