在jQuery中设置#hexpand div动画的错误

I want to expanding it from 121 x 121 pixels to 151 x 151 pixels over the course of three seconds.

I did this but this is not working.

#hexpand $( ".animate" ) #hexpand(
{
    width: "151px",
    height: "151px",
},
5000 );

Here is how animate should be used

jQuery('#hexpand').animate({width:151,height:151},400);

try this:

$("#hexpand").animate({
    width: 150,
    height: 150
}, 5000);