JavaScript中对对象的操做

1、从JavaScript对象中移除/删除一个属性

1.delete

var myObject = {
    "ircEvent": "PRIVMSG",
    "method": "newURI",
    "regex": "^http://.*"
};

// 方法一
delete myObject.regex;
// 方法二
delete myObject['regex'];
// 方法三
var prop = "regex";
delete myObject[prop];

console.log(myObject);

2.undefined

var obj = {
    field: 1     
};
obj.field = undefined;
//object.field === undefined

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