1：把數字轉換為字符串的方法

復制代碼 代碼如下:

var string_value = String(number);
string_value = number.toString();

var n = 17;
binary_string = n.toString(2);//Evaluates to "10001"
octal_string = "0" + n.toString(8);//Evaluates to "021"
hex_string = "0x" + n.toString(16);//Evaluates to "0x11"

var n = 123456.789;
n.toFixed(0);//"1234567"
n.toFixed(2);//"123456.79"
n.toExponential(1);//"1.2e+5"
n.toExponential(3);//"1.235e+5"
n.toPrecision(4);//"1.235e+5"
n.toPrecision(7);//"123456.8"