option = {

    title : {

        text: 'webkit内核依赖',

        subtext: '数据来自网络',

        x:'right',

        y:'bottom'

    },

    tooltip : {

        trigger: 'item',

        formatter : "{b}"

    },

    toolbox: {

        show : true,

        feature : {

            restore : {show: true},

            saveAsImage : {show: true}

        }

    },

    legend : {

        data : ['HTMLElement', 'WebGL', 'SVG', 'CSS', 'Other'],

        orient : 'vertical',

        x : 'left'

    },

    series : (function (){

        // If data have been loaded

        if (webkitDepData) {

            //webkitDepData has been required and defined in webkit-dep.js

            webkitDepData.minRadius = 5;

            webkitDepData.maxRadius = 8;

            webkitDepData.gravity = 1.1;

            webkitDepData.scaling = 1.1;

            webkitDepData.steps = 20;

            webkitDepData.large = true;

            webkitDepData.useWorker = true;

            webkitDepData.coolDown = 0.995;

            webkitDepData.itemStyle = {

                normal : {

                    linkStyle : {

                        opacity : 0.5

                    }

                }

            }

            return [webkitDepData];

        } else {

            return [];

        }

    })()

};