how to use E-Chart disconnect function?

Question

i have grouped different graphs. so that when i zoom one E-charts graph other graphs of same web page was getting zoomed. but now i want to disable the graphs getting grouped. here is my code

if (checkbox.checked == true){
echarts.connect([chart1,chart2,chart3]);
}

if (checkbox.checked == false){
echarts.disconnect([chart1,chart2,chart3]);
}

kindly can you help me out with this?