给Symbol传递对象的转换

var obj = { valueOf: function() { return 3; }, toString: function() { return 2; }};

const sym = Symbol(obj);console.log(sym); // 'Symbol(2)' call toStringconsole.log('2' + obj); //'23' call valueOf

转载于:https://www.cnblogs.com/ax-null/p/6855692.html