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<html>
<head>
<meta charset=utf-8" />
</head>
<body>
<input type="text" id="text" />
<script type="text/javascript">
var cityArr = ['广东','山东','河南'];
console.log("cityArr:"+cityArr);
var inputTxt = document.getElementById("text");
inputTxt.onchange = function(){
var inputArr = inputTxt.value.split(',');
console.log("inputArr:"+inputArr);
var result = cityArr.filter(function(item,index,array){
return (inputArr.indexOf(item)==-1)
});
console.log("result"+result);
};
</script>
</body>
</html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="jquery.min.js"></script>
<script type="text/javascript">
var cityStr = '广东,山东,河南,湖南,湖北,云南,辽宁,四川,内蒙古,浙江,江苏,福建,广西,贵州,上海,河北,吉林,甘肃,新疆,山西,安徽,天津,陕西,重庆,宁夏,海南,黑龙江,青海,西藏,江西';
function drop(){
var drop = $('#number').val();
var dropArr = drop.split(',')
for (var i = 0;i<=dropArr.length - 1; i++) {
cityStr = cityStr.replace(dropArr[i],'');
};
cityStr = cityStr.replace(/[,]+/g,',');
console.log(cityStr);
}
</script>
</head>
<body>
<input type="text" id="number" value="四川,广西,新疆" /><br />
<input type='button' value='open' onclick="drop();"/>
</body>
</html>