JavaScript的匿名方法书写模式

 

 

Code patterns for anonymous function

There are several ways to write anonymous function

匿名函数的书写方式有很多种

The Bad Pattern : It won't work and you'll get a syntax error

糟糕的模式：不但不会运行，还会有语法错误

<script>
function(){

alert(1);

}();
</script>

Pattern 1 : Function Literal

模式1：直接写成方法调用

 

Declare Function as an Object first then execute it.

先声明一个匿名方法然后立即执行

<script>(function(){alert(1);} ) ( );</script>

Pattern 2 : Prior Expression

模式2：利用表达式优先级

Use parentheses to force a declared function to be executed sinceJavaScript evaluates expressions from the inner parentheses to outerparentheses

使用圆括号来强制执行一个声明了的方法。

<script>( function(){alert(2);} ( ) );</script>

Pattern 3 : Void Operator

模式3：使用void操作符

We can use "void" to evaluate a lone operand without using parentheses as the wrapper. of function

这个真没看懂说的是什么意思……

<script>void function(){alert(3);}()</script>

Conclusion

建议

 

Technically these three patterns are equivalent, but I do prefer the pattern 3 for my own reasons.

从技术上讲这三个模式是一样的，但从我自身来说更喜欢模式3。

 

You may review these patterns and see which make sense most for you.