delete属性删除

var globalVal = 1;
delete globalVal; // false

(function(){
    var localVal = 1;
    return delete localVal;
}()); // false

function fd(){}
delete fd; // false

(function(){
    function fd(){};
    return delete fd;
}());//false

ohNo = 1;
console.log(window.ohNo); // 1
delete ohNo; //true

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