前端js获取对象中的值

Question

{"type":"line","x1":429,"y1":135,"x2":374,"y2":182,"x3":432,"y3":220,"x4":559,"y4":306,"x5":605,"y5":191,"x6":458,"y6":100}
我该如何从对象中获得x，y的所有的值以及最大值与最小值？

Answer 1

var map = {"type":"line","x1":429,"y1":135,"x2":374,"y2":182,"x3":432,"y3":220,"x4":559,"y4":306,"x5":605,"y5":191,"x6":458,"y6":100};
var x = [], y = [];
for (var n in map) {
    if (n.charAt(0)=="x") {
        x.push(map[n]);
    }
    if (n.charAt(0)=="y") {
        y.push(map[n]);
    }
}
alert("x所有值："+x+"\nx最大值："+Math.max.apply(Math,x)+"\nx最小值："+Math.min.apply(Math,x)+"\ny所有值："+y+"\ny最大值："+Math.max.apply(Math,y)+"\ny最小值："+Math.min.apply(Math,y));