JavaScript的继承
1.调用基类的构造函数function classA(sColor){this.color = sColor;this.sayColor = function(){alert(this.color);};}function classB(sColor,sName){this.newMethod = classA;this.newMethod(sColor);delete this.newMethod;this.name = sName;this.sayName = function(){alert(this.name);};}/*var objA = new classA('red');var objB = new classB('blue','classb');objA.sayColor();objB.sayColor();objB.sayName();*/
2.使用apply，call函数
function classC(sColor){this.color = sColor;this.sayColor = function(){alert(this.color);};}function classD(sColor,sName){//classC.call(this,sColor);classC.apply(this,new Array(sColor));this.name = sName;this.sayName = function(){alert(this.name);};}/*var objC = new classC('redc');var objD = new classD('blued','classd');objC.sayColor();objD.sayColor();objD.sayName();*/
3.原型继承
function classE(sColor){this.color = sColor;}classE.prototype.sayColor = function(){alert(this.color);};function classF(sColor,sName){classE.call(this,sColor);this.name = sName;}classF.prototype = new classE();classF.prototype.sayName = function(){alert(this.name);};/*var objE = new classE('red2');var objF = new classF('blue2','classf');objE.sayColor();objF.sayColor();objF.sayName();if(objF instanceof classE) alert('objF instanceof classE');*/
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