Javascript 对象数组转换成字符串？

Question

jsFiddle --> http://jsfiddle.net/rVLN2/1/

我是菜鸟 - 我知道我的脚本效率低下，但我正在努力。我有一个对象数组设置，如:

var SatWaterMetric = [
  {"T":0,"Psat":0.6117,"vf":0.001,"vg":206,"hf":0.001,"hfg":2500.9,"hg":2500.9},
  {"T":5,"Psat":0.8725,"vf":0.001,"vg":147.03,"hf":21.02,"hfg":2489.1,"hg":2510.1},
  {"T":10,"Psat":1.2281,"vf":0.001,"vg":106.32,"hf":42.022,"hfg":2477.2,"hg":2519.2},
  ...................................];

然后我有一个函数可以从 html 中提取一个值，并根据表格插入数字值。

 function interpolate(myval, unit) {

    if (unit == "T") {
        for (var i=0;i<SatWaterMetric.length;i++) {
            if (myval < SatWaterMetric[i].T) {

                T_low = SatWaterMetric[i-2].T;
                T_high = SatWaterMetric[i-1].T;

                Psat_low = SatWaterMetric[i-2].Psat;
                Psat_high = SatWaterMetric[i-1].Psat;                    

                vf_low = SatWaterMetric[i-2].vf;
                vf_high = SatWaterMetric[i-1].vf;

                vg_low = SatWaterMetric[i-2].vg;
                vg_high = SatWaterMetric[i-1].vg;

                hf_low = SatWaterMetric[i-2].hf;
                hf_high = SatWaterMetric[i-1].hf;

                hfg_low = SatWaterMetric[i-2].hfg;
                hfg_high = SatWaterMetric[i-1].hfg;

                hg_low = SatWaterMetric[i-2].hg;
                hg_high = SatWaterMetric[i-1].hg;

                var factor = (myval - T_low) / (T_high - T_low);

                Psatx = (1 * Psat_low) + ( 1 * factor * (Psat_high - Psat_low));
                vfx = (1 * vf_low) + ( 1 * factor * (vf_high - vf_low)); 
                vgx = (1 * vg_low) + ( 1 * factor * (vg_high - vg_low)); 
                hfx = (1 * hf_low) + ( 1 * factor * (hf_high - hf_low)); 
                hfgx = (1 * hfg_low) + ( 1 * factor * (hfg_high - hfg_low)); 
                hgx = (1 * hg_low) + ( 1 * factor * (hg_high - hg_low));
                Tx = myval;
                break;
            }
        }

        $('#txtpsat').val(Math.round(Psatx*100000)/100000);
        $('#txtvf').val(Math.round(vfx*10000000)/10000000);
        $('#txtvg').val(Math.round(vgx*100000)/100000);
        $('#txthf').val(Math.round(hfx*10000)/10000);
        $('#txthg').val(Math.round(hgx*100)/100);
        $('#txthfg').val(Math.round(hfgx*100)/100);

    } else if (unit == "Psat") {

        //Repeat everything but for Psat

    } else if (unit == "vf") {

        //Repeat everything but for vf

               } else {}
}

});

现在这只是为了在“T”已知的情况下求解这些值。我正在尝试编写一个程序来确定输入了哪个值(“Psat”、“vg”、“vf”等)，然后根据该值评估所有其他数字。按照我现在的设置方式，我基本上必须为 Psat、vg、vf、hg、hf 和 hfg 重复所有代码。看起来效率很低。有没有办法将其缩减为一个平滑的函数？ .

. jsFiddle --> http://jsfiddle.net/rVLN2/1/

.

Answer 1

您错过了 javascript 的一个非常酷的功能。

obj.Prop

与

相同

obj['Prop']

因此，您只需使用单位作为值的键。