js 主动异常

 

 

navigator.permissions.query({name: 'speaker'}).then(function(t){
    debugger;;
}).catch(function(c){
    debugger;;
})

 

 

let tstr = Function.prototype.toString;
Object.setPrototypeOf(tstr,Object.create(tstr)).toString();

VM299 脚本代码段 #21:9 Uncaught TypeError: Cyclic __proto__ value
at Function.setPrototypeOf (<anonymous>)