JSON.stringify() 的替代方法

Question

我想要 JSON.stringify() 的替代方法。 我正在使用 JSON.stringify，但出現循環 object 值之類的錯誤。 我不知道如何消除此錯誤，所以我想知道是否有其他方法。

DCSSPACE.SaveAndOpenJSONWriter = function(canvas) {

    //multiple tab.....
    var mydata = [];
    var area = {}, DCS = {}, workspace = {};
    var len = DCSSPACE.collection.length;
    for (var k = 0; k < len; k++) {
        var result = [];
        var tabid = DCSSPACE.collection.models[k].id;
        var canvas = DCSSPACE.collection.get(tabid).get("workflow");
        //for node
        var figures = canvas.getFigures();
        for (var i = 0; i < figures.getSize(); i++) {
            if (figures.get(i).type == "draw2d.Node") {
                var node = {};

                node.blockType = getBlockType(figures.get(i));
                node.x = figures.get(i).getX();
                node.y = figures.get(i).getY();
                node.id = figures.get(i).getId();
                node.type = figures.get(i).type;
                node.width = figures.get(i).getWidth();
                node.height = figures.get(i).getHeight();
                node.label = figures.get(i).getLabel();
                node.sequenceNo = figures.get(i).getSequenceNo();
            node.model = figures.get(i).model;

                result.push(node);
            }
        }
        //for lines
        var lines = canvas.getLines();
        for (var j = 0; j < lines.getSize(); j++) {
            if (lines.get(j).type == "draw2d.nodeConnetion") {
                var nodeConnection = lines.get(j).getConnectionAttrubutes();

                nodeConnection.source = lines.get(j).getSource();
                nodeConnection.target = lines.get(j).getTarget();
                result.push(nodeConnection);
            }
        }
        area = {
            tabid : tabid,
            attr : result
        };

        mydata.push(area);
        result=[];
        workspace = {
            DCS : mydata
        };
    }
    //console.log(mydata);
    var arr = JSON.stringify(workspace, null, 4);
    console.log(arr);
    DCSSPACE.SaveAndLoadFigure = result;

    return workspace;

};

Answer 1

如果不使用字符串化，則可以復制它，如下所示：

OBJtoString(object [,n])賦2個參數：

• object （需要）您需要記錄的對象（在我的發布數組中，對象是相同的）

• n個空間，用於縮進對象項中的每個新行。

   var OBJtoString = function(_o,_m,_rf,_dep,_res){ _dep = [], _rf = function(obj,n,_n,_a,_k,_i,_ws,_f,_e){ if(typeof obj != "object") return false; if(typeof _a === "undefined") _a = "FIRST PARENT OBJECT"; _dep.push(obj), _f = (_dep.length < 1) ? function(){} : function(_z,_x){ for(_x = 0; _x <= _dep.length; _x++){ if(obj[_z] == _dep[_x]) return true; } return false; } _ws = ""; if(typeof n === "undefined") n = 1; if(typeof _n === "undefined") _n = n; for(_k = 0; _k <= n; _k++){ _ws += " "; } var response ="{ \\n"; for(var _i in obj){ if(typeof obj[_i] !== "object"){ if(typeof obj[_i] === "string") obj[_i] = "'"+obj[_i].toString()+"'"; if(typeof obj[_i] === "boolean") obj[_i] = obj[_i].toString() + " (boolean)"; response += _ws + _i + " : " + obj[_i].toString(); response += "\\n"; continue; } response += (_f(_i)) ? _ws + _i + " : "+ _a +" (prevent loop)\\n" : _ws + _i + " : " + _rf(obj[_i],n+_n,_n,_a); } if(_n != n) response += _ws; return response +="} \\n"; } _res = _rf(_o,_m); _dep = []; return _res; } 

用途示例：

var example = {ciao : "hellow", saluto : {ciao : "ciao", dam : true}};
example.parentObj = example;
console.log(OBJtoString(example,4));

返回：

 { 
     ciao : 'hellow'
     saluto : { 
          ciao : 'ciao'
          dam : true (boolean)
     }
     parentObj : FIRST PARENT OBJECT (prevent loop)
}

其他例子：

var example = {ciao : "hellow", saluto : {ciao : "ciao", dam : true}};
example.parentObj = example;
example.f = {
    g : example
}
console.log(OBJtoString(example,4));

返回：

{ 
     ciao : 'hellow'
     saluto : { 
         ciao : 'ciao'
         dam : true (boolean)
         } 
     parentObj : FIRST PARENT OBJECT (prevent loop)
     f : { 
         g : FIRST PARENT OBJECT (prevent loop)
         } 
} 

Answer 2

我發現 util.inspect() 非常有用。

您可以打印整個 object console.log(util.inspect(myObj))

或者使用可選的 arguments util.inspect(object, showHidden=false, depth=2, colorize=true)

文檔： https://nodejs.org/en/knowledge/getting-started/how-to-use-util-inspect/