如：{0: 1, 1: 2, 2: 3, 3: 4, 4: 5}，
怎么把对象改为{tex1: 1, tex2: 2, tex3: 3, text4: 4, text5: 5}

var opt = {};
for(var k in obj){ opt['tex'+obj[k]] = obj[k]; }