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undefined
null
this
false
true
The text was updated successfully, but these errors were encountered:
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WeakMap对象
WeakMap 构造器
WeakMap ( [ iterable ] )
undefined
,抛 TypeError 异常undefined
或null
,返回 mapWeakMap 原型对象上的属性
WeakMap.prototype.delete ( key )
this
值false
true
,true
false
WeakMap.prototype.get ( key )
this
值undefined
true
,返回 p.[[Value]]undefined
WeakMap.prototype.has ( key )
this
值false
true
,返回true
false
WeakMap.prototype.set ( key, value )
this
值true
,WeakSet 对象
WeakSet 构造器
WeakSet ( [ iterable ] )
undefined
,抛 TypeError 异常undefined
或null
,返回 setfalse
,返回 setWeakSet 原型对象属性
WeakSet.prototype.add ( value )
this
值true
,WeakSet.prototype.delete ( value )
this
值false
true
,true
false
WeakSet.prototype.has ( value )
this
值false
true
,返回true
false
The text was updated successfully, but these errors were encountered: