Can javascript functions be defined using var?

Javascript functions can be defined with var. In JavaScript, a function can be defined through a declaration or an expression, using the syntax "var funName = new Function (parameter list, "function structure statement");".

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

In JavaScript, functions can be declared and defined through the function keyword.

function funName([参数列表]) {
    statements
}

You can also use the Function() constructor to define it through an expression:

var funName = new Function(参数列表,body);

The parameter types of Function() are all strings, and the body represents the function structure statement of the created function. , separated by semicolons between body statements.

Usage example:

You can omit all parameters and only pass a string to represent the function body.

var f = new Function ("a", "b", "return a+b");  //通过构造函数来克隆函数结构

In the above code, f is the name of the function created. The same function is defined, and the function keyword can be used to design a function with the same structure.

function f(a, b) {  //使用function语句定义函数结构
    return a + b;
}

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