JavaScript继承方式实例

function parent(){ 
this.x=10; 
} 
function child(){ 
var parentObj=new parent(); 
for(var p in parentObj)this[p]=parentObj[p]; 
} 
var childObj=new child(); 
alert(childObj.x);

function parent(){ 
this.x=10; 
} 
function child(){ 
this.parent=parent; 
this.parent(); 
delete this.parent; 
} 
var childObj=new child(); 
alert(childObj.x);

function parent(){ 
this.x=10; 
} 
function child(){ 
parent.call(this); 
} 
var childObj=new child(); 
alert(childObj.x);

原型抄写

function parent(){ 
} 
parent.prototype.x=1; function child(){ 
} 
for(var p in parent.prototype)child.prototype[p]=parent.prototype[p]; 
child.prototype.y=2; 
var childObj=new child(); 
alert(childObj.x);

function parent(string){ 
var child=new Function("this.x=10;"+string); 
return child; 
} 
var child=new parent("this.y=20;"); var childObj=new child(); 
alert(childObj.y);

function parent(){ 
this.x=10; 
} 
function child(){ 
} 
child.prototype=new parent(); 
var childObj=new child(); 
alert(childObj.x);

function parent(){ 
this.x=10; 
} 
function child(){ 
var ret=new parent(); 
ret.y=20; 
return ret; 
} var childObj=new child(); 
alert(childObj.x);