JS 循环遍历JSON数据

var points = [
    {x: 111, y: 220, value: 35},
    {x: 111, y: 191, value: 80},
    {x: 111, y: 158, value: 86},
    {x: 111, y: 34, value: 12},
    {x: 111, y: 287, value: 38},
    {x: 111, y: 66, value: 32},
    {x: 111, y: 118, value: 50},
    {x: 111, y: 254, value: 73},
    {x: 111, y: 216, value: 91},
    {x: 111, y: 236, value: 80},
    {x: 290, y: 106, value: 7},
    {x: 290, y: 131, value: 58},
    {x: 290, y: 197, value: 14},
    {x: 290, y: 132, value: 33},
    {x: 290, y: 277, value: 6},
    {x: 290, y: 261, value: 50},
    {x: 290, y: 224, value: 97},
    {x: 290, y: 19, value: 43},
    {x: 290, y: 218, value: 38},
    {x: 290, y: 184, value: 87}
];

for(var i = 0;i < points.length; i++){
    alert(points[i].value);
}

方法二
var data=[{name:"a",age:12},{name:"b",age:11},{name:"c",age:13},{name:"d",age:14}];  for(var o in data){  

alert(o);  

alert(data[o]);  

 alert("text:"+data[o].name+" value:"+data[o].age );   

 }