Javascript Google图表-PHP数组到JS的问题（arrayToDataTable的数据不是数组）

我试图用谷歌图表显示图表，但不知何故，我的部分数组被视为字符串，谷歌图表无法读取

我正在使用以下代码初始化Google图表：

initCharts("https://www.gstatic.com/charts/loader.js",displayCharts);   

function initCharts(url, callback)
{
    var head = document.head;
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = url;

    script.onreadystatechange = callback;
    script.onload = callback;

    head.appendChild(script);
}   

然后调用我的函数：

function displayCharts()
{
    chart_types = ["battery","battery"];
    chart_datas =["[['timing','charge'],['1min',1],['2min',1],['3min',1],['4min',2],['5min',2],['6min',3],['7min',4],['8min',4],['9min',5],['10min',5],['11min',6],['12min',6],['13min',7],['14min',7],['15min',8],['16min',9],['17min',9],['18min',10],['19min',10],['20min',11],['21min',12],['22min',12],['23min',13],['24min',14],['25min',14],['26min',15],['27min',15],['28min',16],['29min',16],['30min',17],['31min',18],['32min',18],['33min',19],['34min',19],['35min',20],['36min',20],['37min',21],['38min',22],['39min',22],['40min',23],['41min',23],['42min',24],['43min',24],['44min',25],['45min',26],['46min',26],['47min',27],['48min',27],['49min',28],['50min',28],['51min',29],['52min',30],['53min',30],['54min',31],['55min',31],['56min',32],['57min',32],['58min',33],['59min',33],['60min',34],['61min',34],['62min',35],['63min',36],['64min',36],['65min',37],['66min',37],['67min',38],['68min',38],['69min',39],['70min',39],['71min',39],['72min',40],['73min',40],['74min',41],['75min',41],['76min',42],['77min',42],['78min',43],['79min',43],['80min',44],['81min',44],['82min',45],['83min',45],['84min',46],['85min',46],['86min',47],['87min',47],['88min',48],['89min',48],['90min',49],['91min',49],['92min',50],['93min',50],['94min',51],['95min',51],['96min',52],['97min',52],['98min',53],['99min',53],['100min',54],['101min',54],['102min',55],['103min',55],['104min',55],['105min',56],['106min',56],['107min',57],['108min',57],['109min',58],['110min',58],['111min',59],['112min',59],['113min',60],['114min',60],['115min',60],['116min',61],['117min',61],['118min',62],['119min',62],['120min',63],['121min',63],['122min',64],['123min',64],['124min',64],['125min',65],['126min',65],['127min',66],['128min',66],['129min',67],['130min',67],['131min',67],['132min',68],['133min',68],['134min',69],['135min',69],['136min',70],['137min',70],['138min',71],['139min',71],['140min',71],['141min',72],['142min',72],['143min',73],['144min',73],['145min',74],['146min',74],['147min',75],['148min',75],['149min',76],['150min',76],['151min',77],['152min',77],['153min',77],['154min',78],['155min',78],['156min',79],['157min',79],['158min',80],['159min',80],['160min',80],['161min',81],['162min',81],['163min',82],['164min',82],['165min',83],['166min',83],['167min',84],['168min',84],['169min',84],['170min',85],['171min',85],['172min',86],['173min',86],['174min',86],['175min',87],['176min',87],['177min',88],['178min',88],['179min',88],['180min',89],['181min',89],['182min',90],['183min',90],['184min',90],['185min',91],['186min',91],['187min',91],['188min',92],['189min',92],['190min',92],['191min',92],['192min',93],['193min',93],['194min',93],['195min',93],['196min',94],['197min',94],['198min',94],['199min',95],['200min',95],['201min',95],['202min',95],['203min',96],['204min',96],['205min',96],['206min',97],['207min',97],['208min',97],['209min',97],['210min',97],['211min',98],['212min',98],['213min',98],['214min',98],['215min',98],['216min',98],['217min',98],['218min',98],['219min',98],['220min',99],['221min',99],['222min',99],['223min',99],['224min',99],['225min',100]]","[['timing','discharge100','discharge50'],['1min',100,98],['2min',100,98],['3min',100,98],['4min',100,98],['5min',100,98],['6min',100,98],['7min',100,98],['8min',100,98],['9min',100,98],['10min',100,97],['11min',100,97],['12min',100,97],['13min',100,97],['14min',100,97],['15min',100,97],['16min',100,97],['17min',100,97],['18min',100,97],['19min',100,96],['20min',100,96],['21min',100,96],['22min',100,96],['23min',100,96],['24min',100,96],['25min',99,96],['26min',99,95],['27min',99,95],['28min',99,95],['29min',99,95],['30min',99,95],['31min',99,95],['32min',98,95],['33min',98,94],['34min',98,94],['35min',98,94],['36min',98,94],['37min',98,94],['38min',98,94],['39min',98,94],['40min',98,94],['41min',97,93],['42min',97,93],['43min',97,93],['44min',97,93],['45min',97,93],['46min',97,93],['47min',97,93],['48min',97,92],['49min',96,92],['50min',96,92],['51min',96,92],['52min',96,92],['53min',96,92],['54min',96,92],['55min',96,91],['56min',96,91],['57min',95,91],['58min',95,91],['59min',95,91],['60min',95,91],['61min',95,91],['62min',95,91],['63min',95,90],['64min',95,90],['65min',94,90],['66min',94,90],['67min',94,90],['68min',94,90],['69min',94,90],['70min',94,89],['71min',94,89],['72min',94,89],['73min',93,89],['74min',93,89],['75min',93,89],['76min',93,89],['77min',93,88],['78min',93,88],['79min',93,88],['80min',92,88],['81min',92,88],['82min',92,88],['83min',92,88],['84min',92,88],['85min',92,87],['86min',92,87],['87min',91,87],['88min',91,87],['89min',91,87],['90min',91,87],['91min',91,87],['92min',91,86],['93min',91,86],['94min',91,86],['95min',90,86],['96min',90,86],['97min',90,86],['98min',90,86],['99min',90,85],['100min',90,85],['101min',90,85],['102min',90,85],['103min',89,85],['104min',89,85],['105min',89,85],['106min',89,84],['107min',89,84],['108min',89,84],['109min',89,84],['110min',88,84],['111min',88,84],['112min',88,84],['113min',88,84],['114min',88,83],['115min',88,83],['116min',88,83],['117min',88,83],[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    chart_locations = ["charging_chart","discharging_chart"];


    for (a=0;a<chart_types.length;a++)
        {
            chart_type = chart_types[a];
            chart_data = chart_datas[a];

            chart_location = chart_locations[a];
            google.charts.load('current', {'packages':['corechart']}); 

            setTimeout(function() 
                {
                    if (chart_type == "battery")
                            {
                                console.log("battery");
                        
                                var data = google.visualization.arrayToDataTable(chart_data);
                                var chart = new google.visualization.LineChart(document.getElementById(chart_location));
                                var options = { bar: {groupWidth: "95%"} };
                                chart.draw(data,options);
                            }   
                }, 3000);
            
        }


}

函数显示图表（）
{
图表类型=[“电池”、“电池”]；
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chart_datas = [[['timing','charge'],['1min',1],['2min',1],['3min',1], ... ,['999min',1,0]]];

google.charts.load('current', {
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