js implements character limit Chinese characters = two characters

This time I will bring you js to implement character limit Chinese characters = two characters, js to implement character limit Chinese characters = two characters What are the precautions , the following is a practical case, let’s take a look one time.

html

<input type="text" id="txt">

Core js code

//字符串截取
function getByteVal(val, max) {
	var returnValue = '';
	var byteValLen = 0;
	for (var i = 0; i < val.length; i++) {
		if (val[i].match(/[^\x00-\xff]/ig) != null)
		byteValLen += 2;
		else
		byteValLen += 1;
		if (byteValLen > max)
		break;
		returnValue += val[i];
	}
	return returnValue;
}
$('#txt').bind('keyup',function(){
	var val=this.value;
	if(val.replace(/[^\x00-\xff]/g,"**").length>14){
		this.value=getByteVal(val,14)
	}
})

Note: The code uses jquery bindingevent, so jqueryframework needs to be added.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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