js 截取10个字节
function Count(text, long) {
var strlen="";
var str = document.getElementById('TextBox1').value;
var realLength = 0, len = str.length, charCode = -1;
for (var i = 0; i < len; i++) {
charCode = str.charCodeAt(i);
if (charCode >= 0 && charCode <= 128)
realLength += 1;
else
realLength += 2;
}
var maxlength = new Number(long); // Change number to your max length.
if (realLength > maxlength) {
for (var i = 0; i <len; i++) {
strleg=str.substring(0,i);
for(var j=0;j<=10;j++)
{
charCode1 = strleg.charCodeAt(j);
if (charCode1 >= 0 && charCode1 <= 128)
j += 1;
else
j += 2;
}
if(j==Number(10))break;
}
text.value =strleg; //text.value.substring(0, maxlength);
alert(maxlength);
}
}