JS自动给文本框的数字加千分位

<head><title>Test</title></head>
<body>
    <input type="text" id="input_box" value=""/>
    <script>
        var input_box = document.getElementById("input_box"),
            valueBuf,
            _valueBuf;
        input_box.onblur =function(){
            valueBuf =this.value;
            _valueBuf = valueBuf.replace(/(\d{3})+$/g, function(){
                var args = arguments,
                    len = args.length,
                    ret = args[0].match(/(\d{3})/g).join(',');
                if(args[0] !== args[len -1]){
                    ret =','+ ret;
                }
                return ret;
            });
            this.value = _valueBuf;
        }

        input_box.onfocus =function(){
            if(valueBuf){
                this.value = valueBuf;
            }
        }
    </script>
</body>
</html>

方法二:

<head><title>Test</title>

</head>
<body>
    <input type="text" id="input_box" value=""/>
    <script>
        var input_box = document.getElementById("input_box"),
            valueBuf;
        window.onload =function(){
            input_box.value ='';
        }
        input_box.onblur =function(){
            valueBuf =this.value;
            this.value = valueBuf.replace(/\d{3}(?=(?:\d{3})*$)/g, function(){
                var args = arguments;
                if(args[1] ===0){
                    return args[0];
                }else{
                    return','+args[0];
                }
            });
        }
        input_box.onfocus =function(){
            if(valueBuf){
                this.value = valueBuf;
            }
        }
    </script>
</body>
</html>

方法三:

<head><title>Test</title></head>
<body>
    <input type="text" id="input_box" value=""/>
    <script>
        var input_box = document.getElementById("input_box");
        input_box.onblur =function(){
            this.value =this.value.replace(/\d+?(?=(?:\d{3})+$)/g, function(s){
                return s +',';
            });
        }
        input_box.onfocus =function(){
            this.value =this.value.replace(/,/g, '');
        }
    </script>
</body>
</html>

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