以下htmla和javascript代码有什么问题
formToConvert.html
<html>
<head>
<title>ExampleToConvert</title>
<script type = "text/javascript" src = "con.js"></script>
</head>
<body>
<form id ="myform">
<input type = "text" id = "field1" value = "Enter text Here"/><br/>
<input type ="submit" value = "submit" onclick = "convert()"/>
</form>
</body>
</html>
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con.js
function convert()
{
var str ;
str = document.getElementById("field1");
document.writeln(str.toUpperCase());
}
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为什么上面的代码没有给我想要的结果呢?
我有一个mongodb系列.当我做.
db.bill.find({})
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我明白了
{
"_id" : ObjectId("55695ea145e8a960bef8b87a"),
"name" : "ABC. Net",
"code" : "1-98tfv",
"abbreviation" : "ABC",
"bill_codes" : [ 190215, 44124, 190215, 147708 ],
"customer_name" : "abc"
}
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我需要一个操作来从bill_codes中删除重复的值.最后它应该是
{
"_id" : ObjectId("55695ea145e8a960bef8b87a"),
"name" : "ABC. Net",
"code" : "1-98tfv",
"abbreviation" : "ABC",
"bill_codes" : [ 190215, 44124, 147708 ],
"customer_name" : "abc"
}
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如何在mongodb中实现这一目标.
这个unordered_map概念是什么时候内置到g ++中的?
因为以下代码引发错误.
#include<iostream>
#include<unordered_map>
#include<stdio.h>
using namespace std;
std::unordered_map<std::int,int> mirror;
mirror['A'] = 'A';
mirror['B'] = '#';
mirror['E'] = 3;
int main(void)
{
std::cout<<mirror['A'];
std::cout<<mirror['B'];
std::cout<<mirror['C'];
return 0;
}
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我正在编译代码如下:
g++ -c hashexample.cpp
g++ -o result hashExample.o
./result
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我得到的错误是这样的:
inavalid类型int [char [用于aaray下标
有什么办法解决这个问题?
我使用的是Python 2.7.5,我安装了Enum as
pip install Enum
我已经写出以下代码来测试Enum.
from enum import Enum
class Color(Enum):
red = 'Hello'
blue = 'Trello'
green = 'Yello'
for name, attr in Color.__members__.items():
print(attr.value)
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这引起了我的错误说法.
AttributeError: type object 'Color' has no attribute '__members__'.
为什么python无法获得__members__?
我有以下Python词典列表。
[{"country": "IE", "values": ["Server1-17.6650", "Server3-78.6064", "Server2-3.7286"]}, {"country": "CA", "values": ["Server1-100.0000"]}, {"country": "DE", "values": ["Server2-100.0000"]}, {"country": "JP", "values": ["Server2-100.0000"]}, {"country": "IT", "values": ["Server1-100.0000"]}, {"country": "US", "values": ["Server1-6.3158", "Server3-15.7895", "Server2-77.8947", "Server1-5.5556", "Server3-2.7778", "Server2-91.6667", "Server1-12.6145", "Server3-86.8043", "Server2-0.5811"]}, {"country": "CZ", "values": ["Server1-100.0000"]}, {"country": None, "values": ["Server1-100.0000", "Server2-100.0000", "Server2-100.0000", "Server1-100.0000"]}, {"country": "A", "values": ["Server2-100.0000"]}, {"country": "IL", "values": ["Server1-100.0000"]}, {"country": "BR", "values": ["Server2-100.0000"]}, {"country": "KP", "values": ["Server1-100.0000"]}, {"country": "SG", "values": ["Server1-79.2000", "Server2-20.8000"]}, {"country": "ES", "values": ["Server1-100.0000"]}]
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现在,对于values服务器名称在列表中重复的每个服务器名称,我必须对-服务器之后的值求平均值。本质上,对于上面的列表,最终输出变为。
[{"country": "IE", "values": ["Server1-17.6650", …Run Code Online (Sandbox Code Playgroud) 我在python中有两个类
通常的drunk类继承自drunk,并为其move方法提供了一个新的实现,如下所示
class Drunk:
def __init__(self,name):
self.name = name
def move(self,field,cp,dist=1):
if field.getDrunk().name!= self.name:
raise ValueError('Drunk not in the field!')
for i in range(dist):
#pt = CompassPt(random.choice(CompassPt.possibles))
field.move(cp,1)
class UsualDrunk(Drunk):
def move(self,field,dist=1):
cp = random.choice(CompassPt.possibles)
Drunk.move(self,field,CompassPt(cp),dist)
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现在通常的醉酒类有两个名为move但具有不同参数的方法.
那么在这种情况下它是覆盖还是超载?
我有一个程序来查找数字的倒数,但主程序是用C语言编写的,reciprocal函数是用c ++编写的.接下来我有一个头文件reciprocal.hpp,它有一些条件编译代码,使reciprocal函数成为一个extern函数.Can有人请解释一下reciprocal.hpp程序中有什么.
main.c中
#include<stdio.h>
#include<stdlib.h>
int main(int argc,char **argv)
{
int i;
i = atoi(argv[1]);
printf("\nThe reciprocal of %d is %f\n",i,reciprocal(i));
return 0;
}
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reciprocal.cpp
#include<cassert>
#include "reciprocal.hpp"
double reciprocal(int i)
{
assert( i != 0);
return 1.0/i;
}
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reciprocal.hpp
#ifdef __cplusplus
extern "C"
{
#endif
extern double reciprocal(int i);
#ifdef __cplusplus
}
#endif
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我不明白发生了什么reciprocal.hpp.请帮助!!
什么是以下C代码的Java等价物.
for(i = 0;i<n;i++)
scanf("%d",&a[i])
其中i是先前定义的整数,a是一个数组
我有以下jUnit测试用例来测试取幂
@Test
public void testExponentiation() {
AssertSame("Not valid!",32.0,this.myObject.expo(2,5))
}
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我的世博会功能是
public double expo(int n1,int n2) {
return Math.pow(n1,n2);
}
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这不能按预期工作,但AssertSame适用于Integer原始类型.可以解释为什么?
我在JS中有以下JSON.
{
"url":"http://example.com/main.aspx",
"report_template_id":"1",
"interval_secs":"86400",
"analysis_type":"lite",
"email":"rokumar@example.com",
"alerts":["num_domains", "med_load_time", "avg_load_time", "tot_req"]
}
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我希望删除警报列表并用逗号分隔值替换,如下所示.
{
"url":"http://example.com/main.aspx",
"report_template_id":"1",
"interval_secs":"86400",
"analysis_type":"lite",
"email":"rokumar@example.com",
"alerts":"num_domains,med_load_time,avg_load_time,tot_req"
}
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