限制文本框，文本域输入的字符数量

function limitCharsNum(charsNumSpanId,id,max)
{
setTimeout(function(){
var valLen=$("#"+id).val().length;
console.log(max);
if(valLen>max)
{
console.log(valLen);
$("#"+id).val($("#"+id).val().substring(0,max));
}

$("#"+charsNumSpanId).text((max-valLen)<=0?0:(max-valLen));
}, 100);
}

function initLimitCharsNum(charsNumSpanId,id,max)
{
$("#"+id).attr("onpaste","limitCharsNum('"+charsNumSpanId+"','"+id+"',"+max+")");
$("#"+id).attr("oncut","limitCharsNum('"+charsNumSpanId+"','"+id+"',"+max+")");
$("#"+id).attr("onkeydown","limitCharsNum('"+charsNumSpanId+"','"+id+"',"+max+")");
$("#"+id).attr("onkeyup","limitCharsNum('"+charsNumSpanId+"','"+id+"',"+max+")");
$("#"+id).attr("ondrop","limitCharsNum('"+charsNumSpanId+"','"+id+"',"+max+")");
}

initLimitCharsNum('remainderNum1','ztinput1',100);
initLimitCharsNum('remainderNum2','fsnrtextarea1',100);