Detailed explanation of how to terminate function operation code in javascript

1. If you want to terminate a function, just use return. The example is as follows:

function testA(){
    alert('a');
    alert('b');
    alert('c');
}

testA(); When the program is executed, 'a', 'b', 'c will pop up in sequence. '.

function testA(){
    alert('a');
    
return;
    alert('b');
    alert('c');
}

testA(); Program execution will terminate when 'a' pops up.

2. When calling other functions in a function, when the called function is terminated, the calling function is also expected to be terminated. The example is as follows:

function testC(){
    alert('c');
    return;
    alert('cc');
}

function testD(){
    testC();
    alert('d');
}

We see that in TestC is called in testD. In testC, I want to terminate testD through return. However, contrary to expectations, return only terminates testC. When the program is executed, 'c' and 'd' will pop up in sequence.

function testC(){
    alert('c');
    
return false;
    alert('cc');
}

function testD(){
    if(!testC()) return;
    alert('d');
}
testD();

The two functions have been modified. TestC returns false, and testD judges the return value of testC. In this way, when testC is terminated, testD can also be terminated. The program execution will terminate when 'c' pops up. .

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