在浏览器下启用debug模式F12,在console中进行数据调试
1.数据打印
```
console.log('this is debug')
```
2.打印数据表格展示
```
data=[{name:'xing',age:23},{name:'xia',age:22}]
console.table(data)
```
3.测试某段代码的运行时间
```
console.time('t1')
var total=0
for(var i=0;i<10000;i++){ total += i}
console.timeEnd('t1')
//VM851:1 t1: 117263.72314453125 ms
```
