find()

2017-12-08 89 阅读1分钟

[NaN,1,2].find(function(n){if(isNaN(n)){return n;}});
undefined
["jj",1,2].find(function(n){if(isNaN(n)){return n;}});
"jj"
var foo = function(n){if(isNaN(n)){return n;}}; foo(NaN);
NaN
var foo = function(n){if(isNaN(n)){return n;}}; foo("jj");
"jj"