function GenericToString() {}//这是犀牛中的举例
GenericToString.prototype.toString = function() {
var props = [];
for(var name in this) {
if (!this.hasOwnProperty(name)) continue;
var value = this[name];
var s = name + ":"
switch(typeof value) {
case 'function':
s += "function";
break;
case 'object':
if (value instanceof Array) s += "array"
else s += value.toString();
break;
default:
s += String(value);
break;
}
props.push(s);
}
return "{" + props.join(", ") + "}";
}
function Car(iColor, iDoors, iMpg){
this.color = iColor;
this.doors = iDoors;
this.mpg = iMpg;
this.showColor = function(){
alert(this.color);
};
}
Car.prototype=new GenericToString(); //这是我作验证的对象
var test=new Car(red,yingmen,wangwang);
test.toString()//可是结果什么也没有,请教原因。
GenericToString.prototype.toString = function() {
var props = [];
for(var name in this) {
if (!this.hasOwnProperty(name)) continue;
var value = this[name];
var s = name + ":"
switch(typeof value) {
case 'function':
s += "function";
break;
case 'object':
if (value instanceof Array) s += "array"
else s += value.toString();
break;
default:
s += String(value);
break;
}
props.push(s);
}
return "{" + props.join(", ") + "}";
}
function Car(iColor, iDoors, iMpg){
this.color = iColor;
this.doors = iDoors;
this.mpg = iMpg;
this.showColor = function(){
alert(this.color);
};
}
Car.prototype=new GenericToString(); //这是我作验证的对象
var test=new Car(red,yingmen,wangwang);
test.toString()//可是结果什么也没有,请教原因。
GenericToString.prototype.toString = function() {
var props = [];
for(var name in this) {
if (!this.hasOwnProperty(name)) continue;
var value = this[name];
var s = name + ":"
switch(typeof value) {
case 'function':
s += "function";
break;
case 'object':
if (value instanceof Array) s += "array"
else s += value.toString();
break;
default:
s += String(value);
break;
}
props.push(s);
}
return "{" + props.join(", ") + "}";
}
function Car(iColor, iDoors, iMpg){
this.color = iColor;
this.doors = iDoors;
this.mpg = iMpg;
this.showColor = function(){
alert(this.color);
};
}
Car.prototype=new GenericToString(); //这是我作验证的对象
var test=new Car("red","yingmen","wangwang");
alert(test.toString());//可是结果什么也没有,请教原因。
再次验证。以上为结果,没问题。
function Car(iColor, iDoors, iMpg){}中,有三个形式参数,用字符串写的,不用加引号
new Car("red","yingmen","wangwang")中,输入三个实际参数,要加引号
toString()中,把结果存在数组中,但是并没输出这个数组,所以想看到结果的话,还要document.write 或 alert