js判断数组中是否包含某元素

Array.prototype.check_array=function(e){
for(i=0;i<this.length&&this[i]!=e;i++);
return!(i==this.length);//contains:trueorfalse
};

调用：

vartsh=('1','10','11');

if(!tsh.check_array('5')){//iftshnotcontains‘5’
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}