I';我正在更改javascript类的构造函数,但新的构造函数不是';你没打电话吗?
我正在使用SAP UI5框架。我正在创建一个类的实例,然后更改一个类的构造函数。在创建类的第二个实例时,不会调用new ConstructorI';我正在更改javascript类的构造函数,但新的构造函数不是';你没打电话吗?,javascript,javascript-framework,sapui5,Javascript,Javascript Framework,Sapui5,我正在使用SAP UI5框架。我正在创建一个类的实例,然后更改一个类的构造函数。在创建类的第二个实例时,不会调用new Constructor var myConstructor = function(){ alert('my own constructor'); } var btn = new sap.m.Button({text:'Hello World'}) //sap.m.Button is a class sap.m.Button.prototype.constructor =
var myConstructor = function(){
alert('my own constructor');
}
var btn = new sap.m.Button({text:'Hello World'}) //sap.m.Button is a class
sap.m.Button.prototype.constructor = myConstructor; //Changing the constrcutor
var btn2 = new sap.m.Button({text:'h'}); // why myConstructor aint called !
下面是一个工作示例
谢谢这样做实际上并没有改变构造函数
sap.m.Button.prototype.constructor = myConstructor;
您只需更改原型用来引用其构造函数的属性
要完全更改构造函数,只需重新分配它
sap.m.Button = myConstructor;
我还是不知道你为什么要那样做。如果要临时更改构造函数,则可能需要先存储它,然后将其设置回初始版本
var oldCtor = sap.m.Button;
sap.m.Button = = myConstructor;
// finished doing your tasks
sap.m.Button = oldCtor;
这样做实际上并不是在更改构造函数
sap.m.Button.prototype.constructor = myConstructor;
您只需更改原型用来引用其构造函数的属性
要完全更改构造函数,只需重新分配它
sap.m.Button = myConstructor;
我还是不知道你为什么要那样做。如果要临时更改构造函数,则可能需要先存储它,然后将其设置回初始版本
var oldCtor = sap.m.Button;
sap.m.Button = = myConstructor;
// finished doing your tasks
sap.m.Button = oldCtor;
这样做实际上并不是在更改构造函数
sap.m.Button.prototype.constructor = myConstructor;
您只需更改原型用来引用其构造函数的属性
要完全更改构造函数,只需重新分配它
sap.m.Button = myConstructor;
我还是不知道你为什么要那样做。如果要临时更改构造函数,则可能需要先存储它,然后将其设置回初始版本
var oldCtor = sap.m.Button;
sap.m.Button = = myConstructor;
// finished doing your tasks
sap.m.Button = oldCtor;
这样做实际上并不是在更改构造函数
sap.m.Button.prototype.constructor = myConstructor;
您只需更改原型用来引用其构造函数的属性
要完全更改构造函数,只需重新分配它
sap.m.Button = myConstructor;
我还是不知道你为什么要那样做。如果要临时更改构造函数,则可能需要先存储它,然后将其设置回初始版本
var oldCtor = sap.m.Button;
sap.m.Button = = myConstructor;
// finished doing your tasks
sap.m.Button = oldCtor;
更改默认构造函数会影响对象行为,所以不要这样做
<script>
var myConstructor = function(){
alert('my own constructor');
}
var btn = new sap.m.Button({text:'Hello World'})
btn.placeAt('content');
sap.m.Button = myConstructor; //Changing the constrcutor
var btn2 = new sap.m.Button({text:'h'}); // why myConstructor ain't called !
console.log(sap.m.Button.constructor)
//but if you see i doh't write btn2.placeAt("content") because of your constructor don't do many things as need
</script>
var myConstructor=function(){
警报(“我自己的构造函数”);
}
var btn=new sap.m.Button({text:'Hello World'})
btn.placeAt(“内容”);
sap.m.Button=myConstructor//更换施工人员
var btn2=new sap.m.Button({text:'h'});//为什么不叫我的老师!
console.log(sap.m.Button.constructor)
//但是如果你看到我没有写btn2.placeAt(“内容”),因为你的构造函数没有做很多需要做的事情
更改默认构造函数可能会影响对象行为,所以不要这样做
<script>
var myConstructor = function(){
alert('my own constructor');
}
var btn = new sap.m.Button({text:'Hello World'})
btn.placeAt('content');
sap.m.Button = myConstructor; //Changing the constrcutor
var btn2 = new sap.m.Button({text:'h'}); // why myConstructor ain't called !
console.log(sap.m.Button.constructor)
//but if you see i doh't write btn2.placeAt("content") because of your constructor don't do many things as need
</script>
var myConstructor=function(){
警报(“我自己的构造函数”);
}
var btn=new sap.m.Button({text:'Hello World'})
btn.placeAt(“内容”);
sap.m.Button=myConstructor//更换施工人员
var btn2=new sap.m.Button({text:'h'});//为什么不叫我的老师!
console.log(sap.m.Button.constructor)
//但是如果你看到我没有写btn2.placeAt(“内容”),因为你的构造函数没有做很多需要做的事情
更改默认构造函数可能会影响对象行为,所以不要这样做
<script>
var myConstructor = function(){
alert('my own constructor');
}
var btn = new sap.m.Button({text:'Hello World'})
btn.placeAt('content');
sap.m.Button = myConstructor; //Changing the constrcutor
var btn2 = new sap.m.Button({text:'h'}); // why myConstructor ain't called !
console.log(sap.m.Button.constructor)
//but if you see i doh't write btn2.placeAt("content") because of your constructor don't do many things as need
</script>
var myConstructor=function(){
警报(“我自己的构造函数”);
}
var btn=new sap.m.Button({text:'Hello World'})
btn.placeAt(“内容”);
sap.m.Button=myConstructor//更换施工人员
var btn2=new sap.m.Button({text:'h'});//为什么不叫我的老师!
console.log(sap.m.Button.constructor)
//但是如果你看到我没有写btn2.placeAt(“内容”),因为你的构造函数没有做很多需要做的事情
更改默认构造函数可能会影响对象行为,所以不要这样做
<script>
var myConstructor = function(){
alert('my own constructor');
}
var btn = new sap.m.Button({text:'Hello World'})
btn.placeAt('content');
sap.m.Button = myConstructor; //Changing the constrcutor
var btn2 = new sap.m.Button({text:'h'}); // why myConstructor ain't called !
console.log(sap.m.Button.constructor)
//but if you see i doh't write btn2.placeAt("content") because of your constructor don't do many things as need
</script>
var myConstructor=function(){
警报(“我自己的构造函数”);
}
var btn=new sap.m.Button({text:'Hello World'})
btn.placeAt(“内容”);
sap.m.Button=myConstructor//更换施工人员
var btn2=new sap.m.Button({text:'h'});//为什么不叫我的老师!
console.log(sap.m.Button.constructor)
//但是如果你看到我没有写btn2.placeAt(“内容”),因为你的构造函数没有做很多需要做的事情
var btn2=new btn.constructor({text:'h'})
var btn2=new btn.constructor({text:'h'})
var btn2=new btn.constructor({text:'h'})