我正在使用javascript对象的方法来创建HTML来编写该对象。
在该方法中,我有一个日期(字符串格式为SQL日期),我在外部方法中格式化为dd MMM YYYY。外部方法可以很好地返回我需要的字符串,但是当我在对象的方法中设置变量时,它返回为undefined
。
以下是相关代码:
function CreateReview(reviewID, visitDate) {
var reviewObject = {
iD: reviewID,
visitDate: visitDate,
CreateReviewObject : function(c) {
var reviewContainer = document.createElement('div');
reviewContainer.id = 'Review_' + this.iD;
reviewContainer.className = 'Card Review';
var headerDIV = document.createElement('div');
headerDIV.className = 'Header';
var dateTagsDIV = document.createElement('div');
dateTagsDIV.className = 'DateTags';
var datesDIV = document.createElement('div');
datesDIV.className = 'Dates';
var formattedVisitDate = getFormattedDate(this.visitDate);
console.log(formattedVisitDate);
var dateDIV = document.createElement('div');
dateDIV.className = 'Date';
dateDIV.innerHTML = formattedVisitDate;
datesDIV.appendChild(dateDIV);
dateTagsDIV.appendChild(datesDIV);
headerDIV.appendChild(dateTagsDIV);
reviewContainer.appendChild(headerDIV);
return reviewContainer;
}
};
return reviewObject;
}
function getFormattedDate(input) {
input = input.replace(/-/g,'/');
var pattern = /(.*?)\/(.*?)\/(.*?)$/;
var result = input.replace(pattern,function(match,p1,p2,p3){
p2 = parseInt(p2);
p3 = parseInt(p3);
var months = ['jan','feb','maa','apr','mei','jun','jul','aug','sep','okt','nov','dec'];
var date = (p3<10?"0"+p3:p3) + " " + months[parseInt(p2-1)] + " " + p1;
console.log(date);
return date;
});
}
getFormattedDate
中控制台的输出是
12 mei 2015
在CreateReview
中,它是
undefined
我也尝试过以下方式:
function CreateReview(reviewID, restaurant, kitchenTypes, tags, pictures, ratings, thumbPicture, visitDate, introduction, description) {
var reviewObject = {
iD: reviewID,
visitDate: visitDate,
CreateReviewObject : function(c) {
var getFormattedVisitDate = function(visitDate) {
return function() { getFormattedDate(visitDate); };
};
var reviewContainer = document.createElement('div');
reviewContainer.id = 'Review_' + this.iD;
reviewContainer.className = 'Card Review';
var headerDIV = document.createElement('div');
headerDIV.className = 'Header';
var dateTagsDIV = document.createElement('div');
dateTagsDIV.className = 'DateTags';
var datesDIV = document.createElement('div');
datesDIV.className = 'Dates';
var formattedVisitDate = getFormattedVisitDate(this.visitDate);
console.log(formattedVisitDate);
var dateDIV = document.createElement('div');
dateDIV.className = 'Date';
dateDIV.innerHTML = formattedVisitDate;
datesDIV.appendChild(dateDIV);
dateTagsDIV.appendChild(datesDIV);
headerDIV.appendChild(dateTagsDIV);
reviewContainer.appendChild(headerDIV);
return reviewContainer;
}
};
return reviewObject;
}
function getFormattedDate(input) {
input = input.replace(/-/g,'/');
var pattern = /(.*?)\/(.*?)\/(.*?)$/;
var result = input.replace(pattern,function(match,p1,p2,p3){
p2 = parseInt(p2);
p3 = parseInt(p3);
var months = ['jan','feb','maa','apr','mei','jun','jul','aug','sep','okt','nov','dec'];
var date = (p3<10?"0"+p3:p3) + " " + months[parseInt(p2-1)] + " " + p1;
console.log(date);
return date;
});
}
这给了我CreateReview
中的输出:
return function() { getFormattedDate(visitDate); };
为什么当控制台没有时,CreateReview
调用会返回undefined
?
答案 0 :(得分:1)
在function getFormattedDate()
,您有
var result = input.replace(pattern, function(match,p1,p2,p3) {... return date; });
因此result
包含replace
函数的返回值,但getFormattedDate
不返回任何内容==&gt;从CreateReview
调用时未定义。
在函数return result;
的末尾添加getFormattedDate
。