I"m looking at the code written by others, and there"s one thing I don"t understand. The original picture:
:3:
I"m looking at the code written by others, and there"s one thing I don"t understand. The original picture:
:3:
parameter can be written here, because the closure problem is not involved. It is recommended that the landlord take a look at the principle and practice of the closure and the pointing problem of this to understand the role of this writing.
in ordinary functions, this points to itself, and the arrow function this points to the wrapper. If you want to use this directly in the callback function of ajax, you need to write the function as an arrow function:
$ajax.xxx(params, res => {
this.xxx; // this vm
}) let _ this = this;
this code is actually to get the this of the context.
if you want to use this directly, use the arrow function.
can refer to this blog
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