How to get multiple values ​​selected in checkbox in js

Idea: Use the name attribute value to obtain the checkbox object, and then loop to determine the checked attribute (true means selected, false means unchecked). Here is an example demonstration:

1, HTML structure

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2, javascript code (jQuery)

function show(){
    obj = document.getElementsByName("test");
    check_val = [];
    for(k in obj){
        if(obj[k].checked)
            check_val.push(obj[k].value);
    }
    alert(check_val);
}

3. Demonstration effect

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