function showBookInfo( book){
var defaultvalue={
name:'未知书名',
pages:0,
author:'zy'
};
book=mergeObject( defaultvalue,book); //调用mergeObject函数，完成将defaultvalue和book值合并到一起过程
document.write("书名:"+book.name+" "+"页数 ："+book.pages+" 作者："+book.author+"<br/>");
}
//合并两个对象的值，如果realvalue中没有这个属性,则采用defaultvalue中的值，有，则使用realvalue中的值
//返回一个对象
function mergeObject( defaultvalue, realvalue){
if( realvalue && typeof realvalue=='object'){
for(var key in realvalue){ //name pages key通过键取出值
defaultvalue[key]=realvalue[key] || defaulevalue[key]; //realvalue['name'] => 'java深入钱出' realvalue['pages']=>500
/*if( realvalue[key]){
defaultvalue[key]=realvalue[key];
}else{
defaultvalue[key]=defaultvalue[key];
}*/
}
}
return defaultvalue;
}
var book1={ name:'java深入钱出',pages:500};
showBookInfo( book1);
var book2={ name:'js'};
showBookInfo( book2);
function showStuInfo( stu){
var defaultvalue={
name:'张三',
age:18,
gender:0
}
stu=mergeObject( defaultvalue,stu);
document.write("姓名："+" "+stu.name+" "+"年龄："+" "+stu.age+" "+"性别："+(stu.gender==1?'男':'女')+"<br/>");
}
/*function mergeObject( defaultvalue,realvalue){
if(realvalue && typeof realvalue=='object'){
for(var key in realvalue){
defaultvalue[key]=realvalue[key] || defaulvalue[key];
}
}
return defaultvalue;
}*/ //这一段没必要重复，上面有可直接用
var stu1={ name:'李四', age:20};
showStuInfo( stu1);
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