json对象的取出

   // 图形及对应默认属性
    var shapeInfo = {
        rect: 'x:10,y:10,width:200,height:100,rx:0,ry:0',
        circle: 'cx:200,cy:200,r:50',
        ellipse: 'cx:200,cy:200,rx:80,ry:30',
        line: 'x1:10,y1:10,x2:100,y2:100'
    };

    // 默认公共属性
    var defaultAttrs = {
        fill: '#ffffff',
        stroke: '#ff0000'
    };

var attrs = shapeInfo[shape.tagName].split(',');
        var attr, name, value;

        attrForm.innerHTML = "";

        while(attrs.length) {
            attr = attrs.shift().split(':');
            name = attr[0];
            value = shape.getAttribute(name) || attr[1];
            createHandle(shape, name, value);
            shape.setAttribute(name, value);
        }

        for (name in defaultAttrs) {
            value = shape.getAttribute(name) || defaultAttrs[name];
            shape.setAttribute(name, value);
        }