[英]Different type of function declaration in javascript
1)Below is Function declaration with variable name 1)下面是带有变量名的函数声明
var x = function (a, b) {return a * b};
2)Below is another type of function in javascript in angular1 2)下面是angular1中javascript中的另一种函数
var method = {
add_category: function(data, success, failure) {
$upload.upload({
url: baseUrl() + 'add_category',
data: data
}).success(success).error(failure);
},
fileupload: function(data, success, failure)
{
$upload.upload({
url: baseUrl() + 'ImageUpload',
data: data
}).success(success).error(failure);
}
return method;
}
What is the difference between on both the code?两者上的代码有什么区别? first method values assign into one variable like this(var x = function (a, b)) (option 1) how second code(option 2) will works with semicolon like this(fileupload: function(data, success, failure))?
第一种方法值分配到这样的一个变量中(var x = function (a, b)) (选项 1)第二个代码(选项 2)如何使用这样的分号(文件上传:函数(数据,成功,失败))? how data will assign in fileupload variable?
数据将如何在文件上传变量中分配?
In JavaScript, a function is a first class citizen , exactly like a string, a number or a object.在 JavaScript 中,函数是一等公民,就像字符串、数字或对象一样。 Thus it can be assigned to a variable, and used everywhere a variable is expected.
因此它可以分配给一个变量,并在任何需要变量的地方使用。
This notation:这个符号:
var obj = {
item1: 10,
item2: "string",
item3: function (a,b) { return a*b; }
}
defines an object with three properties : a number, a string and a function.定义具有三个属性的对象:数字、字符串和函数。 This is equivalent to:
这相当于:
var fn = function (a,b) { return a*b; };
var obj = {
item1: 10,
item2: "string",
item3: fn
}
and you call it like this:你这样称呼它:
var prod = obj.item3(2,4); // returns 8
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