sanwei_web/static/lib/uninpho/earthLoader.js

(function () {

    let scriptArr = Array.from(document.getElementsByTagName('script'))
    let host, targetScript;
    scriptArr.map(item => {
        let src = item.getAttribute('src')
        if (item.src.match('earthLoader.js')) {
            host = src.split('earthLoader.js')[0];
            targetScript = item;
        }
    })
    let cesiumDir = "./thirdParty/Cesium/";

    let cesiumJS = `${cesiumDir}Cesium.js`;
    let cesiumCss = `${cesiumDir}Widgets/widgets.css`;

    let earthLib = "./Uninpho.js";

    let thirdJsArr = {
        "turfjs": './thirdParty/turf.min.js',
        "heatmap": './thirdParty/heatmap.js',
        "echarts": './thirdParty/echarts.js',
        "kriging": './thirdParty/Kriging/kriging.js',
        "dat.gui": './thirdParty/dat.gui.min.js',
    }


    function loadResource(arr, type) {

        function loadScript(url) {
            var script = '<script type="text/javascript" src="' + url + '"><' + '/script>';
            document.writeln(script);
        }

        function loadCSS(url) {
            var css = '<link rel="stylesheet" href="' + url + '">';
            document.writeln(css);
        }

        if (type === "js") {
            for (let i = 0; i < arr.length; i++) {
                loadScript(`${host}${arr[i]}`);
            }
        } else if (type === "css") {
            for (let i = 0; i < arr.length; i++) {
                loadCSS(`${host}${arr[i]}`)
            }

        }
    }


    function loadJS(url, callback) {
        var script = document.createElement('script'),
            fn = callback || function () {};
        script.type = 'text/javascript';
        //IE    
        if (script.readyState) {
            script.onreadystatechange = function () {
                if (script.readyState == 'loaded' || script.readyState == 'complete') {
                    script.onreadystatechange = null;
                    fn();
                }
            };

        } else {
            //其他浏览器    
            script.onload = function () {
                fn();
            };
        }
        script.src = host + url;
        document.getElementsByTagName('head')[0].appendChild(script);
    }
    //按需加载第三方资源库 
    function loadIncludes(callback) {
        let include = targetScript.getAttribute('include');
        if (include && include.split(',').length > 0) {
            let includes = include.split(',');
            let total = includes.length;
            let tag = 0;
            includes.map(item => {
                if (thirdJsArr[item]) {
                    loadJS(thirdJsArr[item], () => {
                        tag++;
                        if (tag == total) {
                            callback();
                        }
                    });
                }
            });

        }
    }

    function main() {
        //加载球
        function loadEarth() {
            loadJS(earthLib, () => {
                if (window.onload) {
                    onload();
                }
                if (window.earthReady!==undefined) {
                    earthReady();
                }
            })
        }
        //加载Cesium以及第三方库
        loadResource([cesiumCss], "css");
        loadJS(cesiumJS, () => { 
            let include = targetScript.getAttribute('include');
            if (include && include.split(',').length > 0) {
                loadIncludes(() => {
                    loadEarth();
                });
            } else {
                loadEarth();
            }

        });
    }

    main();

})()