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2013-07-20 回答

试试这个： limit.jsview plaincopy to clipboardprint?

function limit(){

var txtNote;//文本框

var txtLimit;//提示字数的input

var limitCount;//限制的字数

var isbyte;//是否使用字节长度限制(1汉字=2字符)

var txtlength;//到达限制时，字符串的长度

var txtByte;

this.init=function(){

txtNote=this.txtNote;

txtLimit=this.txtLimit;

limitCount=this.limitCount;

isbyte=this.isbyte;

txtNote.οnkeydοwn=function(){wordsLimit()};txtNote.οnkeyup=function(){wordsLimit()};

txtLimit.value=limitCount;

}

function wordsLimit(){

var noteCount=0;

if(isbyte){noteCount=txtNote.value.replace(/[^\x00-\xff]/g,"xx").length}else{noteCount=txtNote.value.length}

if(noteCount>limitCount){

if(isbyte){

txtNote.value=txtNote.value.substring(0,txtlength+Math.floor((limitCount-txtByte)/2));

txtByte=txtNote.value.replace(/[^\x00-\xff]/g,"xx").length;

txtLimit.value=limitCount-txtByte;

}else{

txtNote.value=txtNote.value.substring(0,limitCount);

txtLimit.value=0;

}

}else{

txtLimit.value=limitCount-noteCount;

}

txtlength=txtNote.value.length;//记录每次输入后的长度

txtByte=txtNote.value.replace(/[^\x00-\xff]/g,"xx").length;

}

}

function limit(){

var txtNote;//文本框

var txtLimit;//提示字数的input

var limitCount;//限制的字数

var isbyte;//是否使用字节长度限制(1汉字=2字符)

var txtlength;//到达限制时，字符串的长度

var txtByte;

this.init=function(){

txtNote=this.txtNote;

txtLimit=this.txtLimit;

limitCount=this.limitCount;

isbyte=this.isbyte;

txtNote.οnkeydοwn=function(){wordsLimit()};txtNote.οnkeyup=function(){wordsLimit()};

txtLimit.value=limitCount;

}

function wordsLimit(){

var noteCount=0;

if(isbyte){noteCount=txtNote.value.replace(/[^\x00-\xff]/g,"xx").length}else{noteCount=txtNote.value.length}

if(noteCount>limitCount){

if(isbyte){

txtNote.value=txtNote.value.substring(0,txtlength+Math.floor((limitCount-txtByte)/2));

txtByte=txtNote.value.replace(/[^\x00-\xff]/g,"xx").length;

txtLimit.value=limitCount-txtByte;

}else{

txtNote.value=txtNote.value.substring(0,limitCount);

txtLimit.value=0;

}

}else{

txtLimit.value=limitCount-noteCount;

}

txtlength=txtNote.value.length;//记录每次输入后的长度

txtByte=txtNote.value.replace(/[^\x00-\xff]/g,"xx").length;

}

} 页面调用：view plaincopy to clipboardprint?

还可输入个字符