中纬全站仪zt80进入程序老是出来输出到rs232是怎么回事

Question

如题所述

Answer 1

String.prototype.sub = function (n) {
var r = /[^\x00-\xff]/g;
if (this.replace(r, "mm").length <= n) return this;
// n = n - 3;
var m = Math.floor(n / 2);
for (var i = m; i < this.length; i++) {
if (this.substr(0, i).replace(r, "mm").length >= n) {
return this.substr(0, i);
}本回答被提问者和网友采纳