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Execute function now

2022-07-22 19:11:00 【Please call me Gerald 6】

The function is defined , Immediately called , This function is called the immediate execution function , It's often done only once

function （）{
    
alert（" I'm an anonymous function ~~"）;
}()
// No variables defined , Often it will not be implemented , Will report a mistake

Put a bracket around the whole function , Make it a whole , In this way, the browser will not report an error when calling

(function （）{
    
alert（" I'm an anonymous function ~~"）;
})()

(function（a,b）{
    
console.log ("a = " + a);
console.log ("b = " + b);
})(123,456);
// Output "a=123" ,"b=456"

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