结合velocity.js的slideUp和begin:函数的使用

Question

How do you combine these two, so that one can slide an item up, but trigger some JS just as that animation starts.

SlideUp code

 .velocity("slideUp", { delay: 500, duration: 1500 });

Begin: code

$element.velocity({
    opacity: 0
}, { 
    /* Log all the animated divs. */
    begin: function(elements) { console.log(elements); }
});

Doing something like this doesn't work.

.velocity("slideUp", { delay: 500, duration: 1500 }), { 
    /* Log all the animated divs. */
    begin: function(elements) { console.log(elements); }
});

Answer 1

You have to put the begin property inside the options object:

.velocity("slideUp", {
    delay: 500, duration: 150,
    begin: function(elements) { console.log(elements); }
});