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var a = "this is a book";
var b = "is";
var c = "i";
<script type="text/javascript">
var a = "this is a book";
var b = "is";
var c = "i";
alert(/is/.test(a));
alert(/i /.test(a));
</script>
<script type="text/javascript">
var a = "this is a book";
var b = "is";
var c = "i";
if(a.indexOf(' '+b+' ')>-1 && a.indexOf(' '+c+' ')==-1) {alert('OK');}
else alert('No OK');
</script>
function isExist(allStr,str){
return allStr.indexOf(str)>-1
}
a.indexOf(c)==-1
var r=a.indexOf(c)==-1 && a.indexOf(b)>-1;
var i=a.indexOf(c);//返回c在a中的索引,如果不存在 ,返回-1