//除法函式，用來得到精確的除法結果

//返回值：arg1除以arg2的精確結果

function accDiv(arg1, arg2) {

var t1 = 0, t2 = 0, r1, r2;

try {

t1 = arg1.toString().split(".")[1].length

} catch (e) {

}

try {

t2 = arg2.toString().split(".")[1].length

} catch (e) {

}

with (Math) {

r1 = Number(arg1.toString().replace(".", ""))

r2 = Number(arg2.toString().replace(".", ""))

return (r1 / r2) * pow(10, t2 - t1);

}

}