js jquery实时计算输入字符

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在项目中需要倒还可以输入多少字符

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支持键盘输入，sogou,小键盘

//多个事件keydown keypress keyup
$(".ujpg-box-5-textarea").bind("keydown keypress keyup", function() { var id = $(this).attr("id"); var txta = $("#" + id).val();
if (txta.length > 140) {
var trueconten = txta.substring(0, 140)
$("#" + id).val(trueconten);
} $("#divSYZ_txtReply").html("只可输入" + (140 - txta.length) + "个文字");
})