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This article is a detailed introduction to "why use let in order" for everyone. The content is detailed, the steps are clear, and the details are properly handled. I hope this article "why use let in order" can help you solve your doubts. Let's go deeper and learn new knowledge together with the ideas of the small editor.

Because var is a bug in js language designer Brendan Eich's design, this bug cannot be changed, and the author proposed fixing this bug ten years ago.

When explaining, friends need to know that in js language,if and for are scopeless, only function has,var is a global variable,let is block-level scope,const is a constant (unchangeable variables are called constants); let can be seen as a more perfect var

//ES5 uses for loop click events//bug: Every click is the last button clicked to trigger a click for(var i=0;i

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