箭头函数 this指向

箭头函数的this指向是继承而来的，并且指向在定义它时所处的对象，即父级作用域，而不是执行时的对象。这意味着箭头函数内部的this的值不会受到函数调用方式的影响，而是固定指向外层代码块的this。这种特性让箭头函数在使用setTimeout、setInterval等场景下更加方便地使用this。所以，无论箭头函数在哪里被调用，它的this都指向定义它的外层代码块的this，而不是调用时的对象。这与传统的函数的运行机制不同，传统的函数中的this是动态绑定的，它的值会根据函数的调用方式来决定。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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