var ret = typeof onFulfilled === "function" && onFulfilled(value) || value;what kind of assignment is it to change this code into ret? I hope I can make it clear. Thank you. Ha
var ret = typeof onFulfilled === "function" && onFulfilled(value) || value;what kind of assignment is it to change this code into ret? I hope I can make it clear. Thank you. Ha
https://www.cnblogs.com/yy-hh.
look at this should help you.
do you want to ask what this code means?
suppose that if typeof onFulfilled = 'function' is regarded as true, then the expression becomes:
var ret = true & & onFulfilled (value) | | value
then there is an "and / OR" operation. In google
function getRet(value) {
if(typeof onFulfilled === 'function') {
var fulfilledValue = onFulfilled(value)
if(fulfilledValue) {
return fulfilledValue
} else {
return value
}
} else {
return value
}
}
var ret = getRet(value)js & & the preceding value is true (= = true), the backward execution will continue. | | the front value false (= = false) will continue to execute backward. Understand for yourself
if the data type of onFulfilled is function , execute onFulfilled with the parameter value , assign the result returned by the function to ret , otherwise assign value to ret
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