微博字数统计

wordCount.js

var getLength = (function() {
	var trim = function(h) {
		try {
			return h.replace(/^\s+|\s+$/g, "")
		} catch (j) {
			return h
		}
	}
	var byteLength = function(b) {
		if (typeof b == "undefined") {
			return 0
		}
		var a = b.match(/[^\x00-\x80]/g);
		return (b.length + (!a ? 0 : a.length))
	};

	return function(q, g) {
		g = g || {};
		g.max = g.max || 140;
		g.min = g.min || 41;
		g.surl = g.surl || 20;
		var p = trim(q).length;
		if (p > 0) {
			var j = g.min, s = g.max, b = g.surl, n = q;
			var r = q.match(/(http|https):\/\/[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)+([-A-Z0-9a-z\$\.\+\!\_\*\(\)\/\,\:;@&=\?~#%]*)*/gi)
					|| [];
			var h = 0;
			for (var m = 0, p = r.length; m < p; m++) {
				var o = byteLength(r[m]);
				if (/^(http:\/\/t.cn)/.test(r[m])) {
					continue
				} else {
					if (/^(http:\/\/)+(weibo.com|weibo.cn)/.test(r[m])) {
						h += o <= j ? o : (o <= s ? b : (o - s + b))
					} else {
						h += o <= s ? b : (o - s + b)
					}
				}
				n = n.replace(r[m], "")
			}
			return Math.ceil((h + byteLength(n)) / 2)
		} else {
			return 0
		}
	}
})();

function countWord() {
	var text = $('#text').val();
	$('.num span').text(140 - getLength(text));
}