所以，我想创建一个函数创建器，每次调用它时都会读取一个全局变量，而不仅仅是在它被创建时。事实并非如此，因为Python将我的var引用替换为它的当前值。
import operator
space = []
pp = 0 #this is a global var
def op(op,*tval,over = 0, doSave = True):
def operation():
val = list(tval)
val.append(space[pp]) # This apparently becomes val.append(space[0])
temp = op(*val)
if doSave:
space[pp] = temp # This apparently becomes space[0] = temp
return operation
increase = op(operator.add, 1, doSave = True)
增加仅适用于空格[0]，即使我更改了pp，它也只会修改空格的第一个值。
答案 0 :(得分：0)
return operation
应该缩进。
你应该
global space
更改space。
答案 1 :(得分：0)
假设我正确理解了您要实现的目标，您需要使function frontendvalidation(){
var emailaddbox = document.getElementById('emailaddbox').value;
//var emailaddbox = document.forms["signupform"]["emailaddbox"].value;
var username = document.getElementById('username').value;
var password = document.getElementById('passwordbox').value;
var confirmpasswordbox = document.getElementById('confirmpasswordbox').value;
//Default to everything showing an error, and clear the errors as fields are validated.
document.getElementById('username').style.borderColor = "red";
document.getElementById('emailaddbox').style.borderColor = "red";
document.getElementById('passwordbox').style.borderColor = "red";
document.getElementById('confirmpasswordbox').style.borderColor = "red";
// if our signup fields are empty then the border will be red
if(username === '' && emailaddbox === '' && password=== '' && confirmpasswordbox=== ''){
return false;
}
if(username !== '' && username.length >= 5) {
document.getElementById('username').style.borderColor = "green";
}
if (emailaddbox !== '' ){
document.getElementById('emailaddbox').style.borderColor = "green";
}
if (password !== '' && password.length <=5){
document.getElementById('passwordbox').style.borderColor = "green";
}
if ( password != confirmpasswordbox){
document.getElementById('confirmpasswordbox').style.borderColor = "red";
} else if (confirmpasswordbox === password){
document.getElementById('confirmpasswordbox').style.borderColor = "green";
return true ;
}
}
成为全球性的。只需在pp之后添加global pp。
您正在使用闭包来创建运算符，因此Python将绑定当前值def op(..)（即0）而不是全局变量的别名。如果你将pp声明为全局变量，那么别名将被绑定（Python会理解你可以改变它）。
另一项（次要）改进是将您的函数名称从pp更改为op。它不会改变功能，但会提高可读性。