document.getElementById("tb1").innerHTML = document.getElementById("tb1").innerHTML + array[0];
document.getElementById("tb2").innerHTML = document.getElementById("tb2").innerHTML + array[1];
document.getElementById("tb3").innerHTML = document.getElementById("tb3").innerHTML + array[2];
document.getElementById("tb4").innerHTML = document.getElementById("tb4").innerHTML + array[3];
alert数组是有值的,四个table的innerHTML也有值,就是显示不出添加的tr行