Javascript实现真实字符串剩余字数提示的实例代码_javascript技巧

//文本框剩余字数提示(字符大小）
function textLimitCheckSj(thisArea, maxLength, SpanId) {
var str = thisArea.value;
if (getChrLen(str, maxLength) > maxLength * 2) {
thisArea.value = str.substring(0, x-1);
}
else {
var varss = '(剩余字数:' + Math.floor((maxLength * 2 - getChrLen(str, maxLength)) / 2) + ')';
document.getElementById(SpanId).innerHTML = varss;
}
}
function getChrLen(str, maxLength) {
var realLength = 0, len = str.length, charCode = -1;
x = 0;
for (; (x charCode = str.charCodeAt(x);
if (charCode >= 0 && charCode realLength += 1;
else
realLength += 2;
}
return realLength;
}
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onkeyup="textLimitCheckSj(this,50,'spOwner_Name')"> style="color: #808080">（50字以内）